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problem in vectorize script

2 次查看（过去 30 天）
Mani Ahmadian
Mani Ahmadian 2014-10-19
关闭： MATLAB Answer Bot 2021-8-20
Hi
I want to improve my script as:
a=round(50*rand(5,7)+50);
for ii=1
for jj=1
if a(ii,jj)>= 60
b1=2*a(ii,jj)
else
b2=-1*a(ii,jj)
end
end
end
b=b1+b2;
to vetcorized. How can I do that?
Thanks a lot
Mani
  1 个评论
Jan
Jan 2014-10-19
for ii=1 runs the loop over one element only. Do you mean for ii=1:5 ?

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回答（2 个）

Rick Rosson
Rick Rosson 2014-10-19
a = round(50*rand(5,7)+50);
b = 2*a;
b(a<60) = -a;
  1 个评论
Jan
Jan 2014-10-19
The right hand sige need to be masked also:
b(a<60) = -a(a<60);
Jan
Jan 2014-10-19
Or as a one-liner:
b = a .* ((a >= 60) * 3 - 1);

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