select part of matrix matlab code example

Example: matlab select element of matrix

And I want to select a certain element from each row in the matrix for example: I want elements from row 1 column 3, row 2 column 4, row 4 column 3, row 5 column 3 and turn those element into 0. I know I can do something like:
x(1,3)=0;
x(2,4)=0;