# How to deleter specific elements from a matrix without changing its shape

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Maaz Madha on 25 Feb 2021
Answered: Walter Roberson on 25 Feb 2021
I have this matrix and i want to delete every number greater than 0.81 in each column but without changing the overall structure or size of the matrix. The number of columns should be the same only the values in each column should be limited
Walter Roberson on 25 Feb 2021
Do I understand correctly that you want to end up with 20 columns, but each column would be a different length since different number of values would be deleted from it?
If so there is no way to do that using numeric arrays. You would have to put the values into cell arrays.

David Hill on 25 Feb 2021
Instead of deleting why not change them to nan?
yourMatrix(yourMatrix>0.81)=nan;
Maaz Madha on 25 Feb 2021
becasue i want to use these values for further calculations and im not sure nan would work with calculations

Walter Roberson on 25 Feb 2021
%perhaps you meant
yourMatrix(any(yourMatrix>0.81,2),:) = [];
%but column 20 is obviously different and perhaps it should be left out