How I able to replace a element in a particular position of matrix with a another value

I have B=ones(5,5) matrix

now i want to change the 1st row 3rd column element value from 1 to 0.

what is the command for doing that

[dpb]

https://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html

Answer 1

[Voss]

B(1,3) = 0;

[NIRBAN CHAKRABORTY]

Thank you very much it work sir