why ismember() does not return correct result
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Stavros Tsimpoukis
el 10 de Oct. de 2023
Comentada: Dyuman Joshi
el 11 de Oct. de 2023
Hello, I have an original matrix M ( Nx3 ) and another one mat ( Kx3 ). I want to have access to the indicies of rows of the original matrix, M, where the rows of the matrix mat also exist in matrix M. My code is:
idx = find(ismember(M, mat, "rows"))
While most of the rows of mat are correctly returned some rows do not. The common theme is that all of them have the third element equal (1.6).
The array mat:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1507664/image.png)
Rows of array M: ( the row [-2.5 1.65 1.6] exists in the array ! )
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1507669/image.png)
Is this a floating point problem ?
Thanks
Respuesta aceptada
Star Strider
el 10 de Oct. de 2023
They may have very small values that are not shown, especially if they are calculated.
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