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Assigning value to an element in vector

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xplore29
xplore29 2013-9-4
The problem is trivial but the code does not work. I wanted to replace 1 by -1 in a matrix
ip = [0 1 1 0;0 0 0 1]
X=find(ip == 1)
for i=1:length(X)
ip(X(i))=-1
end
But this does not work and is beyond my understanding. Is there any logical error here?
  1 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2013-9-4
编辑：Azzi Abdelmalek 2013-9-4
Your code is correct
Is there any error message? If not what is the result?

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回答（1 个）

Walter Roberson
Walter Roberson 2013-9-4
Runs correctly for me.
In your actual code, is it possible that what you really have for "1" is not an integer? For example if you were searching for 1.3 ? If so then
http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
  2 个评论
xplore29
xplore29 2013-9-4
this small script runs independently...thats true for mr as well. But in my big code this fails. And i am only dealing with integers and therefore getting into decimals is out of scope here.
i also tried
ip(ip==1)=-1
but this also fails in my main code.

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