selection from matrix with condition

Dam
2012 12 6
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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

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Image Analyst
Image Analyst 2012-12-6

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

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Image Analyst
Image Analyst 2012-12-6
Hopefully this wasn't your homework!!!
Dam
Dam 2012-12-6
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

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更多回答（1 个）

Matt J
Matt J 2012-12-6

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

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Dam
Dam 2012-12-6
Thank you for your answer, the second answer works better
Best regards
Matt J
Matt J 2012-12-6
编辑：Matt J 2012-12-7
I can't see how you would have gotten different results, be they better or worse.

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