How to replace the non zero values of a matrix with another value?

How to replace the non zero values of a matrix with another value?

If there is a matrix 5*5 and it contains zero values, how can I keep the zero values and replace the non zero value with 0.1?

in matlab version R2018a

Answer 1

[John D'Errico]

A(A ~= 0) == 0.1;

One line of code. That applies to ANY release of MATLAB. As far back as I have been using MATLAB, so only back about 35 years or so.

And of course, there are other equally simple ways to solve it. For example:

A = (A ~= 0)*0.1;