Changing values in 2D array using logical operators

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Bob
Bob 2012-7-18
I'm sure I've solved this before, but it's befuddled me today.
I have a 2D array and I want to subselect some values and set them to nan:
aa=rand(10,10);
ab(aa<0.5)=nan;
ab is now a 1x100 row vector - how can I perform the operation but maintain the 2D array?

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采纳的回答

Sebastian Holmqvist
aa = rand(10, 10);
aa(aa < 0.5) = NaN;

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