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For loop not initiated

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Jonathan Oekland Torstensen
评论： Image Analyst 2016-8-17
So, I have created a matrix called cent in another for loop, and then:
for
... creates "cent"
end
e = 5 ;
per = zeros(e,e)
for u = 1:e
rsum = 0;
a = 0;
for p=1:e
u
p
Xdiff = 0;
Ydiff = 0;
Zdiff = 0;
Xdiff = (cent(u,1)-cent(:,1)).^2
Ydiff = (cent(u,2)-cent(:,2)).^2
Zdiff = (cent(u,3)-cent(:,3)).^2
a = (Xdiff + Ydiff + Zdiff).^0.5
rsum = cent(u,6) + cent(:,6) ;
if a == rsum(p)
per(p,u) = p ;
else
per(p,u) = 0 ;
end
end
end
The script runs just fine, and I get no error messages. However, i get no display of u and p, and per is returned as a matrix with only zeros if i create it before the first for loop. If i create per as shown below, between the two loops, it is not created at all. I thus think that the code never enters the second loop and run it. Why?

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回答（1 个）

Thorsten
Thorsten 2016-8-17
I have created some sample values for cent and the program runs just fine, entering the second loop as expected. The reason that per is all zero is that the condition
a == rsum(p)
is never true.
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Image Analyst
Image Analyst 2016-8-17
Use the debugger to step through the code line by line and examine variables and see where it goes. That's what everyone does.

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