find values

If I have a matrix where each column refers to depth and each row refers to days, how is it possible to find and keep the values in each column which is between 0 and 30. At the minute some of the values fall below 0 and others reach as high as 100. So how would I just keep the values between 0 and 30 in the same matrix and make every other value as NaN?

cheers

Answer 1

[Wayne King]

X = randi([-5 110],10,10);
X(X<0 | X>30) = NaN;

[Mitch Martelli]

Hi wayne i would like to ask you in which version are added the randi function...later than R2007b?

[Wayne King]

@Mitch Martelli R2008b

[Mitch Martelli]

Thanks a lot...you are very kind