0. It does work! The linear index of 5 is 4 not 5! When you ask a question , make sure you give an example clearly instead of advising others how to answer the question. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. How to find the index in array?. Start Hunting! a=[1 2 3 1] i want b=[1 4] as output..how can i do this? [EDITED] If you are talking of a cell string, this is much faster: D = {'1' '5' '3' '4' '2' '3' '4' '5' '2' '1'}; index = find (strcmp (D, '5')); A manual approach to things causes bugs if you get it wrong, not if you get it right. # Get the maximum value from complete 2D numpy array maxValue = numpy.amax(arr2D) It will return the maximum value from complete 2D numpy arrays i.e. In Python, I can use: The code example also defines a search predicate method named EndsWithSaurus, which accepts a string parameter and returns a Boolean value indicating whether the input string ends in … Yeah, I was originally going to give an answer based on interp1 but had a brainfade on working out how to use it for this! ... Find the treasures in MATLAB Central and discover how the community can help you! Syntax. The findIndex method executes the callback function once for every index 0..length-1 (inclusive) in the Follow 508 views (last 30 days) Vishal Sharma on 25 Jan 2017. Once your data is available in MATLAB Workspace, you can then perform any operations you desire including finding values and their indices which are greater than 10. Based on your location, we recommend that you select: . What I want are the indices where the value -1 occurs, since I have to replace them afterwards. That's it, 4 is all what I want. index = cellfun (@ (x) x==5, C, 'UniformOutput', 1); Or the long and most likely faster form: index = false (1, numel (C)) for k = 1:numel (C) index (k) = (C {k} == 5); end. I want to extract both temperature and time for elements starting at 2017,4,15,00,00,00 and ending at 2017,4,30,23,50,00. You should always give an example that shows the full complexity of the question you are asking though if you want a useful answer. 0 ⋮ Vote. If none is found, find returns an empty matrix. ... Are there any functions that will return the index of … 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. There's probably neater ways to do it too, or shorter, at least! I want to find fractional index when array == 2.5 or any other intermediate value. i have to find the index of the same value in an array,see the following example. This example shows how to filter the elements of an array by applying conditions to the array. If you bother to write a comment, you can write the answer instead of advising on how to write a question. I know, that number, for example, 5, is an element in array X, but I don't know it's index. Other MathWorks country sites are not optimized for visits from your location. Accelerating the pace of engineering and science. For instance, you can examine the even elements in a matrix, find the location of all 0s in a multidimensional array, or replace NaN values in data. 0. Note: this answer is based on the original answer by madhan ravi: https://web.archive.org/web/20190410151058/https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array. Learn more about interpolation, find, array Start Hunting! I have two series both with 52560x1 size. MATLAB returns an array that matches the elements of the array X, element-by-element holding 1s where the matching values in X are the desired values, and 0s otherwise. It isn't magic. Unable to complete the action because of changes made to the page. To find the indices of all the locations where the maximum value (of the whole matrix) appears, you can use the "find" function. To directly find the elements in X that satisfy the condition X<5 , use X(X<5) . assume the matching value is 205; location or order in this case should be 4. 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. Much simpler (and also works for multiple. The array logInd is not an array of double numbers, but have the class logical . Choose a web site to get translated content where available and see local events and offers. arrays matlab I know, that number, for example, 5, is an element in array X, but I don't know it's index. https://www.mathworks.com/help/matlab/ref/find.html maximum = … k = find(x) [i,j] = find(X) [i,j,v] = find(X) Description. But unfortunately 33spm is not in the array 34.8 is which is the closest to 33. 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. Often logical indexing is more efficient, so you might only need this: You may receive emails, depending on your. But if you want to extract row and column you just need to adapt the code Jan gave you. When 'linear' is not specified, I is the index into the operating dimension. It cannot contain 3 vectors and a scalar unless they parts of a single variable like a structure or table variable. You can perform these tasks using a combination of the relational and logical operators. What is the code to find the value closest to 33? Learn more about index, indexing, matlab function, homework One is temperature and the other is time both start at 2017,1,1,00,00,00 and end at 2017,12,31,23,50,00 with a 10 minutes sample. I already know that the perfect outcome of one of these values is 33spm. Please show the expected output for your example values. A cell cannot contain more than one variable. Histogram in Matlab for data bigger than a threshold. Find the index of given value in an array. Vote. my array is [114 205 137 205 144 204]. I want find a particular value (let's say 7) in the first column, and then use the reference to get at the text value in the same row (much like VLOOKUP in Excel). In Python, I can use: I realized this function, using for loop and if statement, but did Matlab doesn't have build-in similar function? Note: for this example, we are arbitrarily find the location of the maximum value in the data, but you can replace data=MAX(data) with any other logical test that will isolate a given value. Hence I used it to find the next value greater than the one you want and did the required maths from there. Find the treasures in MATLAB Central and discover how the community can help you! The structure of the cell array is like this: A is a 27x1 cell where each of the 27 rows has 500000 cell entries (numeric values between -1 and 999). Other MathWorks country sites are not optimized for visits from your location. It isn't magic. Store the row and column return from find and put it in the match cell array. I know, that number, for example, 5, is an element in array X, but I don't know it's index. cell array find MATLAB. Unable to complete the action because of changes made to the page. Find the treasures in MATLAB Central and discover how the community can help you! MathWorks is the leading developer of mathematical computing software for engineers and scientists. Learn more about index of element MATLAB, Image Processing Toolbox Hence I used it to find the next value greater than the one you want and did the required maths from there. Given an array of known point values (Xpoints), which is a 1 x 11 array I'm trying to search and generate a list of index locations that correspond to when the X_ValueTrans (1 x 501) equals the individual elements in the Xpoints array. Therefore I am looking for find() type function that would do the job. 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. Find the index of given value in an array. Tags cell arrays… A solution using find is this. It can't find things that don't exist. Learn more about interpolation, find, array 2. An array of strings is created, containing 8 dinosaur names, two of which (at positions 1 and 5) end with "saurus". https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692300, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692308, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_1259273, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_370203, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_693180, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_370022, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692437, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692620, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692755, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_411503, https://la.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_547788. idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveVal ) - array( idxAboveVal - 1 ) ); Obviously it would need error checking if idxAboveVal is 1 or empty. Also note these formulas will fail if there are duplicate values in the array. Find the index of given value in an array. I need to find the index for the minimum value in pbest other than '0'. https://www.mathworks.com/matlabcentral/answers/365917-how-i-can-find-index-of-element-in-array#answer_290079, https://www.mathworks.com/matlabcentral/answers/365917-how-i-can-find-index-of-element-in-array#comment_502775. When 'linear' is specified, I contains the linear indices of A corresponding to the maximum values. To find array elements that meet a condition, use find in conjunction with a relational expression. 17 Learn more about interpolation, find, array The value of the maximum where the logical index is zero, is left out. The "min" and "max" functions in MATLAB return the index of the minimum and maximum values, respectively, as an optional second output argument.
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