Creating a parameter which indicates adding values to only part of the elements in a Matrix?

alpha represents the proportion of elements in OldMatrix can be from 0 to 1.

How can I create a create a parameter like alpha that indicates that I only only want to add an integer like data to only a proportion of the elements in matrix such as OldMatrix ?

Answer 1

[Roger Stafford]

   p = 1:round(alpha*size(OldMatrix,1));
   NewMatrix(p,:) = OldMatrix(p,:)+data;