non zero elements above 70 and below -70 zero

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Jeroen
Jeroen 2012-2-17
编辑： Jan 2013-10-15
hello people,
In a matrix I want that all non zero elements above 70 and below -70 is zero.
How do I do that ?
Thank you!

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回答（4 个）

Honglei Chen
Honglei Chen 2012-2-17
Use logical index
x(x>70 | x<-70)=0
the cyclist
the cyclist 2012-2-17
I am not 100% sure what you mean, but here is some code (with comments on my understanding) that you should be able to modify to do what you want
% Some test data:
A = 200*rand(100) - 100;
% Index to values you want to zero out
idx = (A>70) | (A<-70); % Index to values that are bigger than 70 or smaller than -70
% Zero those out
A(idx) = 0;
  1 个评论
Jeroen
Jeroen 2012-2-17
Thank you!
Well it is a matrix of ~40000 by 6. But what if I want to replace only those elements in the first two rows?

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carmen
carmen 2012-2-17
then you modify Honglei Chen 's approach according to your wish:
x(1:2,x(1:2,:)>70 | x(1:2,:)<-70)=0
that should be it.
Sean de Wolski
Sean de Wolski 2012-2-17
A(abs(A)>70) = 0;

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