How to change values of specific elements inside a matrix?

I have a 10x10 matrix y. I want to look for all the elements inside y that have a value greater than 100 and divide them by 10. How do I go about this? I was thinking of this if y > 100 y = y./10; end But it doesn't work for someone reason. How can I fix this? Or are there any alternate solutions?

Answer 1

[Azzi Abdelmalek]

idx=y>100
y(idx)=y(idx)/10