Replacing values in a matrix with random normally distributed value?

Hi, So I have 10x10matrix; A=[]

 25  25  25  25  25  15  20  20  10      10
20  10  25  20  20  20  15  20  20  10
20  15  25  20  20  20  15  15  20  15
20  20  10  20  20  20  15  15  20  15
15  25  25  20  20  20  15  15  10  15
10  25  25  20  20  20  15  15  10  15
15  15  15  20  20  10  15  15  10  20
20  25  15  15  15  10  10  10  10  20
25  15  15  10  15  10  20  20  20  20
15  15  10  10  15  15  15  15  15  15.

Is there a way for me to replace all the

• 10's with a normally distributed random values between 0.02-0.03
• 15's with a normally distributed random values between 0.02-0.04
• 20's with a normally distributed random values between 0.03-0.05
• 25's with a normally distributed random values between 0.10-0.20

Cheers, Jim

Answer 1

[Walter Roberson]

mask = A == 10;
A(mask) = 0.02 + 0.01 * rand( 1, nnz(mask) );