Replacing numbers in a matrix

I am trying to create a command that replaces all even numbers in a matrix with their square root values. I've already figured out how to determine which numbers are even. Please help.

function repEven = repEven(A)
if rem(A,2) == 0 % determines if numbers are even
    
end

Answer 1

[Walter Roberson]

Use logical indexing.

if rem(A,2) == 0 % determines if numbers are even

That determines whether all of the numbers in A are even, not if any one of them is even.

Also, do not name your output variable the same thing as your function.

[Ryan Williams]

Appreciate the tips, but how would I use logical indexing to determine if numbers are even?

[Walter Roberson]

A = [5 8 19]

A = 1×3

5 8 19

rem(A,2) == 0

ans = 1×3 logical array
   0   1   0

is a logical vector of true and false values.

A([false, true, false])

ans = 8

[Ryan Williams]

Ok I understand, can you give me a hint on how to replace the numbers in my matrix with new ones?