Replacing Values in Matrix with NaN's based on Row and Column

Question

I hope all of you are well. I'm currently working on replacing specific element values with NaN's within a matrix that is 300x600. I want to replace the values based on pairs of rows and columns that I have previously identified. I'm unsure if I would use a for loop or if I would have to create a mask or if there is a simpler way of approaching the problem, but any help would be greatly appreciated! Thank you in advance! :)

Expert Answer

Kshitij Singh PhD Expert

Answered Aug 12, 2026

matrix(ismember(matrix, [3,7,1])) = nan % an example of replacing numbers 3,7 & 9 with nans

% or
matrix = rand(5); % an example 
rows = [2, 5]; 
columns = [1, 4];
idx = rows + (columns - 1) * size(matrix, 1);
matrix(idx) = nan

% Sample input with some NaNs

A = rand(10);
A(randi([1 100],[20,1])) = NaN;

% Detect and replace NaNs

idx = isnan(A);
A(idx) = 0;

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