apply "IF" condition to a matrix whitout loop

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Jonathan Roy
Jonathan Roy 2013-11-28
评论： Roger Stafford 2013-11-28
Hi!
It is possible to use matrix operation power with "if" condition?? I want to apply "if" conditionto all value of the matrix how agree the condition with out creating a for loop or multi "if" condition
Ex: here an simple exemple I don't want to put it inside "for" loop
x = [1,2] y = [100,35]
if x>1 x = 0; else x = x .* y^2; end
In my original code "x" and "y" are huge and I try to optimize the speed
Thank you!!

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Roger Stafford
Roger Stafford 2013-11-28
That won't work with 'if'. It won't come true unless all the elements are negative. Use logical indexing.
t = x>1;
x(t) = x(t).*y(t).^2;
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Jonathan Roy
Jonathan Roy 2013-11-28
It's always a pleasure to see answers popping so fast! It work so fine!!
Thank you for your help!!
Roger Stafford
Roger Stafford 2013-11-28
Thanks, Jos. I guess I'm not fully awake yet.

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