it does not verify that a couple of values of 'a' exists in 'b' but only if values of each column of 'a' exist in each columns of 'b'. Ps : the solution proposed here Python version of ismember with 'rows' and index does not correspond to the true matlab's ismember function since it does not work element by element i.e. Why python does not have what I would think to be such an important function ? I use it countless times in my calculations. I guess it is because Matlab uses a built-in mex function. Moreover, even when the function works (because arrays are small enough), it is about a 100times slower than in Matlab. ismembertol scales the tol input using the maximum absolute values in the input arrays A and B.Then ismembertol uses the resulting scaled comparison tolerance to determine which elements in A are also a member of B. It seems that you already send a pull request that have been accepted. This will be a great use as your elegant solution allows to process very large arrays in a very short time. when doing np.all(a = b, axis=2).any(axis=1) it needs to create an array of size (ma,mb,2) and it is too big. Comparison tolerance, specified as a positive real scalar. and I am trying to use ismember to assign values from cell array x to cell array y based on two conditions: if the values of the second and third colum of cell array x match the values of the second and third colum of cell array y, then I want to replace the values of the 4th column of cell array y with the values of the first column of cell array x (sorry if its a bit confusing). All you need to do is replace the code of the function isrowin (a, b) with the code of your function ismemberrow. For timetables, ismember takes row times into account to determine equality. If A and B are tables or timetables, then ismember returns a logical value for each row. Elsewhere, the array contains logical 0 ( false ). ![]() ![]() The ismember module ( ) crashes because at some point i.e. Learn more about array, ismember Dear all, Hello, I am writing a simple function of ismember to check if an element in one matrix matches the one in another matrix, however it returns 0, although I am sure the value matches. Description example Lia ismember (A,B) returns an array containing logical 1 ( true) where the data in A is found in B. I can't find an efficient way to conduct Matlab's "ismember(a,b,'rows')" with Python where a and b are arrays of size (ma,2) and (mb,2) respectively and m is the number of couples.
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