Replacing all values of a with b in a matrix?

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JARED VAHRENBERG 2020-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/630829-replacing-all-values-of-a-with-b-in-a-matrix

评论： JARED VAHRENBERG 2020-10-29

Say I define that a and b are 3 and 4, respectively. I heva a matrix M that I want to swap all instances of a with b. How would I do that? I tried doing

res = M(M==a) = b;

it works if I don't have the res there but I need the res there to output my result for this specific issue. It keeps telling me it needs to be

res = M(M==a) == b; but that only gives me the 2x1 logical array that has 0 0 in it

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madhan ravi 2020-10-29

Show what’s M and how the resulting M should be with e a small example.

JARED VAHRENBERG 2020-10-29

For example say I wanted to have matrix M= [2,5;2,8] and wanted to swap the 2's out for 1's to where then I get res = [1,5;1,8]. Why is it that my code works in the command window but as soon as I add in that res in the editor it gets angry?

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