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

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Med Future
Med Future 2022-3-1
回答： KSSV 2022-3-1
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

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KSSV
KSSV 2022-3-1
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

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