MATLAB: How to replace all the ones in a matrix with the string ‘hey’

Question

matrix= [1 0 0.1 0.001 4; 5.9 2.1 3.15 8.95 1.11]

All the ones should be replaced with 'hey'

This is my code

matrix= [1 0 0.1 0.001 4; 5.9 2.1 3.15 8.95 1.11];
matrix= num2str(matrix);
matrix(matrix=='1') = 'h'

when I replace 'h' with 'hey' it gives me this error

 matrix(matrix=='1') = 'hey'

I have just started to learn MATLAB. please help

Answer 1

newmatrix = num2cell(matrix);
newmatrix(matrix == 1) = {'hey'};