for if matrix

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Amit
Amit 2012-2-3
编辑： Andreas 2013-9-30
for i=1:n-1
for j=1:n-1
for r=1:332
if i + r > 333
data(i+r,:)=0;
*else if i-r = < 0
data(i-r,:)=0;*
else if j+r > 333
data(:,j+r)=0;
else if j-r = < 0
data(:,j-r)=0;
end
end
end
end
end
end
end
Please tell me how I can correct the error at i-r = < 0

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采纳的回答

Walter Roberson
Walter Roberson 2012-2-4
Change the '= <' to '<=' (without the apostrophes.)
http://www.mathworks.com/help/techdoc/ref/le.html
  9 个评论
显示 7更早的评论
Walter Roberson
Walter Roberson 2012-2-4
Your line s=s+data(i+r,j)+data(i-r,j) is outside of any of your "if" tests, so it is going to always be executed. It will cause a problem if i-r is 0 or negative.
Amit
Amit 2012-2-4
Thanks Walter

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更多回答（1 个）

Jan
Jan 2012-2-4
Do you really have a space between the = and the < ? If so, remove it.
Please add the error message. Otherwise we have to guess, what your problem might be.
  1 个评论
Amit
Amit 2012-2-4
Error: File: file.m Line: 19 Column: 33
The expression to the left of the equals sign is not a
valid target for an assignment.

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