How to replace value with zero to match the size of array

Hello everyone, I hope you are doing well.

I have the dataset which is shape of 250x1000, i want to get only first 20 values from each row and replace all other value with zero

how can i do that in matlab

Answer 1

[KSSV]

Let A be your 250x1000 array.

B = zeros(size(A)) ; % initialize the zero matrix
B(:,1:20) = A(:,1:20) ;  % replace first twenty values from each row