selection from matrix with condition

Hi to all, actually i m having a matrix X=250*10 from which i want to choose the colomns that have an average >0.1 and a standard diviation >0.2 and put them in a new matrix 250*k ((where k depends on the colomns that satisfy the 2 (between 0 and 10)) Thank you in advance for your help with this

best regards

Answer 1

[Image Analyst]

How about this:

stdX = std(X, 1)
meanX = mean(X, 1);
meetCriteria = meanX > 0.1 & stdX > 0.2
out = X(:, meetCriteria);

[Image Analyst]

Hopefully this wasn't your homework!!!

[Dam]

Thank you for your answer it s not my homework i m learning matlab alone so this question could be very easy for you but for me it s not :) Thank you once more Dima

Answer 2

[Matt J]

    X(:,std(X)<=.2 | mean(X)<=0.1)=[];

[Dam]

Thank you for your answer, the second answer works better

Best regards

[Matt J]

I can't see how you would have gotten different results, be they better or worse.