Matlab find index of value in array. Oct 20, 2019 · Find index of same values in array.
Matlab find index of value in array. html>vkfv
Feb 11, 2014 · I was wondering if there is a quick way in matlab (pretty sure there is and I just don't know it!) to get all the values of an array at specific indices. I just realised my attempt to simplify my actual question made it misleading. Here's how you can find the position of 8 in your 3-D matrix: May 23, 2019 · You don‘t have to see "through your eyes to know the last index where the actual value is 3" , you just use find() as shown in my answer with the option 'last' to know the index. so when you count the occurrences of each element in (a) against Sep 27, 2018 · It returns the index of the first occurence of array y in array x. Compared to others it is also a O(n) solution - but the drawback is the slow Matlab looping on large array of elements Feb 26, 2020 · Find/Match index of variable from an array. Jul 4, 2021 · Learn how to use the find() function to get the indices of elements in a 1-D or 3-D array in MATLAB. The ~ simply trashes the first parameter - It's not storing it into a variable as we don't need it. If X is a logical expression, then v is a logical array. 3. ) and it worked, but this has to be done Index array, returned as a vector, matrix, or multidimensional array. It returns the indices of the elements that satisfy a given condition. 0000i And I wanted to change any complex number A linear index allows use of a single subscript to index into an array, such as A(k). The answer I am looking for is c = [3,5,7]. g. While MATLAB displays arrays according to their Jan 25, 2017 · Select a Web Site. How can I find which row has a NaN value in a column matrix or vice ve Aug 3, 2022 · My question is how to find the index of the objects with certain properties in the array 'school'? For example, if I want to find students with age 19, the result will be index [1,4] If I want to find students with age 19 and sex 'boy', the result will be index [1] Sep 29, 2016 · I have a string-array, myString = ' 23. Jan 3, 2014 · [row,col] = find(A==0) The single output you got was the linear index. I already know that the perfect outcome of one of these values is 33spm. Dec 17, 2019 · Learn more about find command, vector MATLAB. For example, 'Find' and 'F' are both matches for lettersPattern, since the number of letters for a match is not specified. Aug 25, 2014 · Each row in IDX contains the index of the nearest neighbor in X for the corresponding row in Y. Jun 13, 2013 · Hi, I have a cell array with values and empty cells. For example, for A = [pizza] [pepperoni] [cheese] [] [] I'd like to return a Since R2024a. It is worth while noting that you can use these functions along specific dimensions:. Index Finding the indices of duplicate values in one Learn more about duplicate values, multiple values in array, find duplicate values and locations MATLAB Jul 4, 2021 · FIND Find indices of nonzero elements. " Note: if you only need to know the first location, then you can also use Jan 28, 2013 · As pointed by Evgeni max and min can return the argmax and argmin as second arguments. Example: If I have an array: a = [1,3,5,7,9] and I have my list of indices [2,3], I am looking for a function that will give me back [3,5] which are the values at indices 2,3 in the array 'a Jun 26, 2020 · How to search for an array inside another array?. Originally I wrote a working script in matlab using find(. As such, I don't see how more vectorized you could get other than a single function call to unique . Dec 8, 2018 · I would like set the values of A corresponding to the idx to 0 and the values of B that do not correspond to the idx to 0, somethike like: A(idx) = 0 and B(~idx) = 0. Here's how you can do it: Here's how you can do it: a = [7 8 8 2 5 6]; A linear index allows use of a single subscript to index into an array, such as A(k). Index array, returned as a vector, matrix, or multidimensional array. Elsewhere, it contains logical 0 ( false ). Aug 4, 2024 · then the answer to that is "NO, MATLAB does not have a built-in function in which you can provide only the array name and the value, and MATLAB will return all the indices of the value in the array. I have a vector M with possibilities of multiple duplicates, and I want to create an index vector that ignores all the duplicates. Apr 30, 2013 · Yes, you are correct, the actual data is similar to 1498. 1. 98 or 1. The linear index applies in general to any array in matlab. e. However, MATLAB complains about Unbalanced or unexpected parenthesis or bracket on the first parenthesis before the 3. Aug 4, 2024 · Learn how to use the find function and other methods to locate the index of a specific value in an array of integers or floating-point numbers. See Variable-Sizing Restrictions for Code Generation of Toolbox Functions (MATLAB Coder). Is there some way to use the find function to determine the index of Char in myString? May 19, 2015 · For example, if I use the sort function on the array [14 8 91 19], I will get [8 14 19 91]. the output matrix is multidimensional depending on number of inputs. However, “strfind” returns a cell array of indices. It seems simple enough. Logical index to A, returned as a vector, matrix or N-D array containing logical 1 (true) wherever the values (or rows) in A are members of B. To get this, assign the result of the call to max to a two element vector instead of just a single variable. If A contains complex numbers, isinf(A) contains 1 for elements with infinite real or imaginary part, and 0 for elements where both real and imaginary parts are finite or NaN. This file is also available on github. Oct 28, 2019 · With the find function you can look up the linear indices of all non-zero elements in an array. Nov 14, 2015 · this will return the first index k for which normal{k} is the same as string. Aug 29, 2017 · Hi, I would like to get the value and index of elements from a cell array. Learn more about cell, array, index, indexing, nonempty, empty, cells, find, arrays Oct 21, 2010 · Try to use end to automatically obtain the index of the last N-dimensional array indexing in Matlab : find array in middle. First, import power outage data from a spreadsheet into a table. See examples, comments and alternative solutions from MATLAB users. I assume the problem lies in the precision of the values and/or decimal places that are not shown in the readout of the array. Apr 2, 2011 · Logical indexing is closely related to the find function. The operator treats each numeric value as a number of standard 24-hour days. Learn more about matlab, arrays, find, indexing, matrix manipulation MATLAB Dec 14, 2015 · Old thread, but here's one way to do it if you input a vector instead of an array. Oct 12, 2011 · Hi Guys, How can I find the exact location of NaN elements in a matrix. But these "vectorized" methods are slower in modern Matlab versions, because they have to create temporary arrays. Based on your location, we recommend that you select: . Indexing with a Single Index. See examples, comments and answers from MATLAB experts and users. I find that row 1, column 6, is closest to 21. Aug 12, 2011 · From Matlab documentation: I = FIND(X,K,'first') is the same as I = FIND(X,K). Another method for accessing elements of an array is to use only a single index, regardless of the size or dimensions of the array. See examples, syntax, and output for each method. 199999999999999. matlab find specific VALUES in an array. The cell arrays Location and SelfAssessedHealthStatus contain data that belong in categories. A linear index allows use of a single subscript to index into an array, such as A(k). If both have unique entries and I want to find the position of each element of A in array B I can do: [~, pos] = ismember(A,B); Nov 8, 2017 · then the answer to that is "NO, MATLAB does not have a built-in function in which you can provide only the array name and the value, and MATLAB will return all the indices of the value in the array. So if my variable of interest is called 'returns' and is formatted in a t x n matrix, I would like to find all indices in 'returns' that exceed a value X. IBM watson on 23 May 2019 Feb 12, 2024 · MATLAB provides a handy function called find() to simplify locating the index of a specific value within an array. Oct 26, 2013 · I am looping through a vector with a variable k and want to select the whole vector except the single value at index k. Aug 7, 2014 · I want to be able to find indices where values exceed a certain threshold. 654 ' and a character, Char = '. If a cell contains an array, you can access specific elements within that array using two levels of indices. I search for 34, and find that row 3, column 6 is the closest to 34. Dec 3, 2011 · Finding the indices of the elements of one array Learn more about matlab function, vectorization Given two vectors A and B, find the index, idx into A of the element of B so that A(idx)=B. The ComparisionMethod name-value argument is not supported. So, if the indices of the elements which meet the criteria are stored in the matrix below: criteriacheck = [3 5 6 8 20]; Index into Arrays Within Cells. TF = ischange(A) returns a logical array whose elements are logical 1 (true) when there is an abrupt change in the mean of the corresponding elements of A. Learn how to access array elements by position, linear indexing, or logical indexing in MATLAB. made a index Nov 25, 2016 · Once you invoke it the first time and you find the index of the minimum element, you would set this location in your array to NaN, then run min an additional time. The syntax here tells it to locate only one such value, in this instance the first one it finds, and output the index of that value. You can use ischange functionality interactively by adding the Find Change Points task to a live script. For example, you can reshape the 2D array into a 1D array, and call min(), but then you have to convert the index back to the equivalent value for the 2D array using ind2sub(). Dec 20, 2011 · Hello I am looking for a (simple) way to get the index of a row in which two (or n) values exist example: looking for 4 and 5 in [1 5 6; 5 4 3; 9 4 2] will give me 2, because only May 29, 2021 · In my understanding you are trying to find an index of a particular value in double. Find the middle value in array that [~, sortIndex] = sort(A(:), 'descend'); % Sort the values in descending order maxIndex = sortIndex(1:5); % Get a linear index into A of the 5 largest values Here's a solution that finds the 5 largest unique values, then finds all elements equal to those values (which could be more than 5 if there are repeated values), using unique and ismember: Here is a simple double array: array=[3 1 1] Largest element index is 1 or: array=[3 9 1] Largest element index is 2 How can I get the largest element index? Jan 5, 2018 · Learn more about find, nearest, closest, index, specific, certain, value, array Hello, I have an array with 20 values of steps per minute. For instant, I wanted to get the values and indices of the elements which falls within the range 0. 2876 - 0. Dec 20, 2012 · Finding a noninteger value from an array. data(2:end) returns a vector containing elements in the vector data from element 2 to the last element. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). 02). You can use indexing to access the elements of the array. Oct 5, 2012 · Rody, you might be right about the sum/find. finding elements in array Apr 30, 2016 · To find min or max in a subset of a vector - If A is a vector and "lowerBound" and "upperBound" are the bounds of the vector among which you need to find the max (or min) value, then use this command - [Value,Index]=min(A(lowerBound:upperBound)); This returns "Value" as the min or max value among A(lowerBound) and A(uppedBound) and "Index" as If the input is a variable-size array, the length of the dimension to operate along must not be zero at run-time. Sep 10, 2011 · Every variable in MATLAB® is an array that can hold many numbers. Example: [LIA,LocAllB] = ismembertol(A,B,tol,'OutputAllIndices',true) How do I find the indices of a given array A1, *any* of whose values are practically equivalent to *any* of the values of a second array A2? 3 Matlab, finding common values in two array Apr 17, 2010 · You can use end notation to indicate the last element. Also, sum might be faster than find, but A(integer_index) is faster than A(logical_index) because logical_index is a 0-1 vector the size of your data, while integer_index only holds the necessary values. Use logical indexing with a simple assignment statement to replace the values in an array that meet a condition. You can use the find function. Learn more about array, indexing, index, index match, for loop, minimum value Feb 23, 2016 · I search for 21. By setting the location to NaN , you would effectively skip the element that is equal to the smallest at that point in time. For example, C{2,3} returns a 3-by-3 matrix of random numbers. (you can also look up row and column indices, but for higher dimensions you'll need findND) Because of logical indexing, this step is not needed for the indexing itself, but for other cases it is a very powerfull tool. So you can use it on structures, cell arrays, etc. For example, consider the 4-by-4 matrix A: May 21, 2013 · Find index of smallest element in an array not in another array (Matlab) 1 finding the index of an array element that is the first below a given value in MATLAB then the answer to that is "NO, MATLAB does not have a built-in function in which you can provide only the array name and the value, and MATLAB will return all the indices of the value in the array. Jan 25, 2013 · It's worth mentioning that this also works with objects. myProp] == value) works as expected. For example, consider the 4-by-4 matrix A: Aug 4, 2024 · then the answer to that is "NO, MATLAB does not have a built-in function in which you can provide only the array name and the value, and MATLAB will return all the indices of the value in the array. For example, if the variable indexing contain the corresponding indexes:. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. I then return 0 0 0 0 (the first four columns. Jan 11, 2012 · As of MATLAB R2019a, you can use the “groupcounts” function to compute the number of times an element appears in a vector as a summary. Then perform a mean of those 5 values. Find examples of indexing with colon, end, and logical values. What about this (I cannot open the posted MAT file, better post code in the forum which creates the example data): Sometimes it is useful to simultaneously change the values of several existing array elements. Jun 10, 2022 · This is a loop approach equivalent to C or even Basic. If by "how many indices it cover" you mean that you need multiplicities, then just remove the ,1 from the call to find, then you'll get an index vector containing every index k for which normal{k} is equal to string. The find() func Jan 15, 2016 · I want to create an array of indices using Matlab's find-function. You can follow the same pattern with the last encounters. Create Categorical Arrays from Cell Arrays of Character Vectors. In more detail, i have a 601x2201 matrix that contains option values, all i want is to find the closest values to 185. Oct 7, 2009 · The "min" and "max" functions in MATLAB return the index of the minimum and maximum values, respectively, as an optional second output argument. You do not need interp for that. Mar 12, 2016 · For instance, if my matrix is A = [7 3 9;5 8 8;0,2,6] and my condition is A<5, I would like to use a function that gives me [3 NaN 0] or at least tells me where in the matrix I can find those values and use it to index A. Jun 28, 2012 · Index Non-Empty Cells in Cell Array. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. If array is a MxN myClass array with properties: myProp, then find([array. 2. Oct 1, 2012 · One way I thought is to first sort 'ar' (obtain 'sar'), and, since 'ar' has unique elements (forgot to tell), write own searching scheme like: I obtain value 'val' of which I need to find index in 'sar', I compare it with middle value of sar: if it is lower, I search next within a lower half of 'sar', and if higher - in upper half. 2876 + 0. Find the index of each letter. That is, each cell in LocB corresponds to a value in A, and the values in each cell correspond to locations in B. I want to get array C, where array C will be 1000x1 double where the values in B are used to index the values in A like so: C(1) = A(B Feb 3, 2011 · When finding values in multidimensional (i. ind=knnsearch(data',b) c=data(ind) which returns the index (or array of indices), ind, of the closest element (or elements) in data to the elements listed in b. TF = isnan(A) returns a logical array containing 1 (true) where the elements of A are NaN, and 0 (false) where they are not. Apr 10, 2019 · Learn how to use find, interp1 and other functions to find the index of a value in an array. In other words, the elements of the below output “GC” are the counts of the corresponding element values in “GR” (from the original input vector “x”): Sep 23, 2015 · Since you ask for a more generic solution, here is one that should be easily adaptable to other data types. For example, suppose you want to temporarily replace NaN values with zeros Aug 7, 2013 · Then assuming a certain number of spaces around the value is fragile, because the width depends on the values. – Jan 1, 2018 · For more information on working with multidimensional arrays, see Multidimensional Arrays. Vidar's solution does work in that case (quite nicely), so is more general. I tried [C,ia,ib] = unique(M) but I don't quite know how to use ia and ib. Feb 15, 2019 · Get the values of an array from indices in another array: Matlab Hot Network Questions Everyone hates this Key Account Manager, but company won’t act value = magic(5)(3,3); value = (magic(5))(3,3); to dispense with the intermediate variable. Jun 7, 2014 · @user42864: min returns two parameters. Choose a web site to get translated content where available and see local events and offers. You only need to indicate 'last' if you want it the other way around. for your matrix these are the linear indices: 1 4 7 10 2 5 8 11 3 6 9 12 which you could also use to locate an element in a matrix (so for your example the zeros are at linear index 1, 2 and 4). When you want to access selected elements of an array, use indexing. " Note: if you only need to know the first location, then you can also use Apr 25, 2017 · The max function can also return the index of the maximum value in the vector. You can know more using the documentation here. Is it possible to read values from an array/matrix without first assigning it to a variable? Mar 27, 2019 · If you call find without defining the number of indices you want returned, it will return all indices that meet your condition. i want to write a function that gives the max value and its coordinates so to speak of the max value. – Phonon Oct 13, 2015 · So if I had an array that contains real numbers and complex number such as this: r = 0. If you have an odd number of values, this will find the index of the first entry of the median. if instead of 'KU' on the left side, you have an array of strings). To find the index of the element in the array, you can use the find() function. 2 with May 10, 2014 · find all similar index of array in Matlab. Hopefully that explains what I need. how can i do this? This method generalizes Doubt's answer to the case where there are multiple elements in b that you are searching for:. The logical indexing expression is faster for simple cases, but you might use find if you need the index values for something else in the computation. The first parameter returns the minimum of the array and the second parameter returns the location of where this minimum occurs. z is your array, Apr 30, 2019 · Compare the temporary "distances" array to that minimum value (resulting in some binary array), and then use find to get the corresponding indices, which finally can be used to get the values from the original input array x. Mar 8, 2015 · How to find out all array element indices equal to several values (>2) For example, I have an array a=[1 2 3 4 5 5 4 3 2 2 2 1], I want to know the indices of all Here is a fast implementation using binary search. Or if data is a character array, it returns the second character all the way to the last character. While pat matches a sequence of letters having any length, strfind stops as soon as it finds a match and then proceeds to the next match. '. I have tried to use find() with: find(a == b) and it would work if you did this: Dec 20, 2016 · Ox axis is an array that contains time values, and Oy axis is an array which contains the values of the function. If on the other hand the value might not be present in Fa, but Fa is sorted, you can search for values larger than value_to_find and take Mar 31, 2014 · Hi everybody! I am new to Matlab and I have been using it for like one week. Specify the table variables that have values of interest and create an array of row indices where values in those variables meet conditions that you specify. I then return 1 50 2 54. Actually Matlab offers more elegant command, see Stephen23's answer. 15 from the row 'data{1,1}(:,5)'. Using the find() function you can find the indices and the element from the array. For example, the following code produces a row vector 'M' that contains the maximum value of each column of 'A', which is 3 for the first column and 4 for the second column. The expression A(A > 5) is equivalent to A(find(A > 5)). So if your array has more then a total of 2^32 elements in it, the linear index will fail. [IDX, D]= KNNSEARCH(X,Y,'NAME1',VALUE1,,'NAMEN',VALUEN) specifies optional argument name/value pairs: Name Value 'K' A May 1, 2014 · If one input is a duration array, the other input can be a duration array or a numeric array. (Didn't try with empty values) –. So it will discard multiplicities. Edit: Sorry I missed an important detail, I is an existing Feb 8, 2013 · How about doing a sort of your array from lowest value to the highest and then selecting the 5 first values. % % [a,b] = findInSorted(x,s) returns the range which is equal to s. Nov 22, 2012 · [TF,LOC] = ismember(A,S) for the array A returns an array of the same size as A containing 1 where the elements of A are in the set S and 0 otherwise. But as I understand it, this is what you want. Then, use the standard indexing syntax for the type of array in that cell. Oct 8, 2012 · To find the index use find function: find(Fa==value_to_find); Of course, this works only if the value_to_find is present in Fa. greater than 2-D) arrays using the function FIND, it is best to get a single linear index from FIND then convert it to subscripts using the function IND2SUB. 8 million_* rows. See examples, syntax, and directions for different cases of array indexing. " Note: if you only need to know the first location, then you can also use But in this case I get the indexes that do not correspond in fact should be pnt = 4, size = 16, cmd = 2. 0 Comments Show -2 older comments Hide -2 older comments TF = isinf(A) returns a logical array containing 1 (true) where the elements of the array A are Inf or -Inf, and 0 (false) where they are not. I read in the matlab documentation which states: "[row, col, v] = find (X, ) returns a column or row vector v of the nonzero entries in X, as well as row and column indices. This method is known as linear indexing. Sep 6, 2016 · Hi everyone, i have a problem finding values with tolerance in a matrix. In MATLAB the array indexing starts from 1. Replace all values in A that are greater than 10 with the number 10. If one input is a string array, the other input can be a string array, a character vector, or a cell array of character vectors. 03 val1 = 1. 009:10 ind1 = find (A==val) % will work if the val is exact match May 11, 2012 · Find index of smallest element in an array not in another array (Matlab) 0 How can I find the index of the last greater than or equals value in one array, for all values in the first array? Mar 6, 2017 · I have a 20x1 double array A, and a 1000x1 double array B. Example: A linear index allows use of a single subscript to index into an array, such as A(k). unique(A(indexing)); will give you a vector with the unique elements in the sub-vector A(indexing). If the output array B contains repeated elements, then the order of their indices in I matches the order in which they appear in the input array. I'd like to return the index of the first empty cell. Jan 30, 2013 · Interesting! I don't have the stats toolbox, and I've never seen either of those 2 functions before. May 14, 2024 · the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. Jul 31, 2014 · There are some ways, it depends on your taste. The length of this array is the number of times the condition is met. Oct 11, 2021 · In MATLAB, the arrays are used to represent the information and data. Jan 29, 2015 · As you can see, the first time we encounter the value 1, it's at index 2, the first time we encounter the value 2, it's at index 1 and so on. Now I got stuck because I need to individuate the negative entries of an array in order to modify them: I wonder then if there's a way to get the position (row and column) of these entries in the array of interest. Learn more about find array same value Hi all, i have to find the index of the same value in an array,see the following example a=[1 2 3 1] i want b=[1 4] as output. I need to find all elements that fall between 2 values (L,U) in a matrix (A) with *_2. I is the same size as B. . Feb 25, 2011 · In previous versions of MATLAB (before R2016b), you can use the “strfind” function. The find() function in MATLAB is designed to locate nonzero elements of an array. This is the element number by counting down the columns e. command: peaks=find(y1==0. I briefly tried playing around with the delaunayn function, and it seems it wouldn't work if 2 elements in the array were equal. matlabs max function only does 1 dimension. 3069i 0. If you have an even number, it will find the index of the first number which is equally close to the median. Mar 20, 2012 · I want to type something like c = find(a == b), but Matlab doesn't like it that the dimensions don't agree. The indices for the matching are provided in LOC that contains the highest absolute index in S for each element in A which is a member of S and 0 if there is no such index. Mar 27, 2015 · Learn more about matlab, array, find, indexing, index MATLAB How to find the index in 1D array that has closest value to some number ? val =-1. Find the value that corresponds to an index. MATLAB uses a 32 bit integer to store these indexes. " Note: if you only need to know the first location, then you can also use Feb 13, 2013 · i have an output value matrix depending on 3 inputs ranging from p10 to p11 , p20 to p21, p30 to p31. Sometimes it is useful to simultaneously change the values of several existing array elements. Oct 20, 2019 · Find index of same values in array. Weighting scheme, specified as a vector, matrix, or multidimensional array. I = FIND(X) returns the linear indices corresponding to the nonzero entries of the array X. However, you have to store the indices anyway. In order to store the new matrix with 42 at (3,1), MATLAB inserts an additional row into the nonzero values vector and subscript vectors, then shifts all matrix values after (3,1). To find the rows of a table where values meet conditions, use logical indexing. I work with really large arrays (size 1500*200). Nov 9, 2011 · Actually, it should be pointed out that this method doesn't work if you are comparing two arrays of different size (i. Is there a Nov 7, 2012 · I have made an array of doubles and when I want to use the find command to search for the indices of specific values in the array, this yields an empty matrix which is not what I want. This might not be the most memory efficient way of doing this but for just 1000 values it will get the job done! Hope it helps! A linear index allows use of a single subscript to index into an array, such as A(k). But strfind matches 'F' first and Oct 11, 2009 · Every variable in MATLAB® is an array that can hold many numbers. First, use curly braces to access the contents of the cell. Sep 20, 2013 · Learn more about find, ismember, array Hello, Let's say I have 2 arrays of double, call then A and B. 04 x = -10:0. Here is code for a simple example. Sep 18, 2014 · The find function (in its most fundamental application) locates all non-zero entries in its argument. e. Learn more about find I have an array which looks like: x = linspace(0,1,101); To find the index of the maximum point from an array, I can write: [val,ind] = max(x); However, I need the index of a particul Oct 10, 2023 · Learn different methods of finding the index of a specific element or a set of elements in an array using MATLAB built-in functions. If A contains complex numbers, isnan(A) contains 1 for elements with either real or imaginary part is NaN, and 0 for elements where both real and imaginary parts are not NaN. Jun 8, 2020 · The way I intend to use it is to check whether an element index in one matrix is equal to the values stored in another array (where the stored values are the indices of the elements which meet a certain criteria). I have to find the last value on Oy where y (the function) is + or - 2% of 1 (which is 0. The only problem with the linear index is when they get too large. Nov 4, 2018 · I have an array composed of strings '0' 'P' 'E' and 'M' I am trying to find the index of the string 'P' within the array but the current lines I am using If the input is a variable-size array, the length of the dimension to operate along must not be zero at run-time. Using linear indexing to access or assign an element in a large sparse matrix will fail if the linear index exceeds 2^48-1 , which is the current upper bound for the Nov 8, 2017 · then the answer to that is "NO, MATLAB does not have a built-in function in which you can provide only the array name and the value, and MATLAB will return all the indices of the value in the array. The elements of W must be nonnegative. A = rand(4); % 4x4 matrix [ row_max row_argmax ] = max( A, [], 2 ); % max for each row - 2nd dimension [ col_min col_argmin ] = min( A, [], 1 ); % min for each column - 1st dimension I want to find the positions in X of the 0s in the first layer and second layer separately. But instead I want [2 1 4 3] which gives me the indices of elements in the original array. I tried using the limit, and the modified function works perfectly from the range 200 - 300 (including index for floating point) in the column matrix. 95< x <1. Here is what I need to do: I have an array a1 containing time data in the datenum format (incomplete set) and an array v1 (same Sep 21, 2016 · Find index with multiple condition, using find Learn more about multiple vector comparison, find function, & condition with multiple size, large files Hi all, stuck again, search for solutions but with no help. X may be a logical expression. MATLAB ® treats the array as a single column vector with each column appended to the bottom of the previous column. I'm not really sure how to do this with find, but heuristically something like: A = find(X == 0 & 3rd index of X is 1) B = find(X == 0 & 3rd index of X is 2) EDIT. 3127 + 0. " Note: if you only need to know the first location, then you can also use Jan 23, 2015 · Imagine that i have two arrays: a = [1, 2, 5, 7, 6, 9, 8, 3, 4, 7, 0]; b = [5, 9, 6]; I want to find the indices of the values of b in a (only the first hit) ie: c = [3, 6, 5]; Is there an easy Matlab native way to do this without looping and searching. " Note: if you only need to know the first location, then you can also use Aug 8, 2011 · The idea is to sort the vector, and take the middle value. Otherwise you end up computing A>5 twice. I tried using format short g for simplicity. 8236) The cell array contains the indices for all elements in B that are within tolerance of the corresponding value in A. For even-length vectors, we compute the average of the two values in the middle. I'm not sure wich is fast for large arrays, but the above method is more intuitive (in my opinion). Each cell array contains character vectors taken from a small set of unique values (indicating three locations and four health statuses respectively). Index into the table using the row indices. If you specify a weighting scheme, mean returns the weighted mean, which is useful when values in the input data have different levels of importance or the input data is skewed. function [b,c]=findInSorted(x,range) %findInSorted fast binary search replacement for ismember(A,B) for the %special case where the first input argument is sorted. [IDX, D] = KNNSEARCH(X,Y) returns a MY-by-1 vector D containing the distances between each row of Y and its closest point in X. Those will be the 5 min values of your array. Any idea? for k = 1:length(vector) newVector = vector( exluding index k); <---- what mask should I use? % other operations to do with the newVector end Oct 27, 2013 · In order to find the first non-zero row index how do I find the values rather than the indices? MATLAB find first elements in columns of array. Feb 15, 2018 · To find the positions of the value 8 in the vector a = [7 8 8 2 5 6], you can use the find function in MATLAB. matlab; vector; find; How to find the index of specific value in a vector? 1.
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