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# Replacing all even numbers in my matrix with their square root value

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Cy'an Tebo on 15 Mar 2021
Answered: KSSV on 15 Mar 2021
So I put in the code :
A=[1 4 9; 8 16 7; 3 36 4]
X=sqrt(A(rem(A,2)==0))
It did square root each even number but it put it in it's own matrix but I was trying to replace the even number with new values while still having all the other values in the matric still. How do I fix this?
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### Accepted Answer

Mohammad Sami on 15 Mar 2021
You need to assign it back to A to replace the even values.
A=[1 4 9; 8 16 7; 3 36 4];
i = rem(A,2)==0;
A(i) =sqrt(A(i))
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### More Answers (1)

KSSV on 15 Mar 2021
A=[1 4 9; 8 16 7; 3 36 4]
idx = mod(A,2) ;
A(idx==0) = sqrt(A(idx==0))
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