Why am I getting Subscript indices must either be real positive integers or logicals?

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Neo
Neo 2015-7-14
评论： Neo 2015-7-14
Here is the part of my code giving me problems:
channelToCorrelate = A; %A is where the modes are in real space
correlationOutput = normxcorr2(mode(:,:A), Image(:,:, channelToCorrelate));
subplot(2, 2, 3);
imshow(correlationOutput, []);
axis on;
it brings this
Subscript indices must either be real positive integers or logicals.
Error in crosscorrelationcode (line 26)
correlationOutput = normxcorr2(mode(:,:,1), Image(:,:, channelToCorrelate));
A is a matrix of numbers including complex numbers. I thought that was the problem so i tried to use
correlationOutput = logical (correlationOuput)
and
correlationOutput = round(correlationOuput)
I got the same error both times so I then used
channelToCorrelate = logical(A)
but that didn't work because A has comle values and round just brought the same error. What am missing?
  2 个评论
Geoff Hayes
Geoff Hayes 2015-7-14
Neo - what can you tell us about channelToCorrelate and image? The error is telling you that there is a problem at line 26, so why not put a breakpoint there and re-run the code. When you get to that breakpoint you will be able to step through the code and examine the variables that are being manipulated.
Neo
Neo 2015-7-14
channelToCorrelate is the matrix where a smaller image is in the actual image and image is the image itself. Would my breakpoint be dbstopline26? Thank you for your suggestions

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Brendan Hamm
Brendan Hamm 2015-7-14
I can see a few error in the line:
correlationOutput = normxcorr2(mode(:,:A), Image(:,:, channelToCorrelate))
1. The syntax does not make sense, is there supposed to be another comma?
mode(:,:A)
This probably should read:
mode(:,:,A)
but you mention that A has imaginary values so you cannot use it to index.
2. If channelToCorrelate is the same as A then you cannot use this to index into Image.
What is it you are attempting to do with this indexing?
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Brendan Hamm
Brendan Hamm 2015-7-14
That would likely help. But it would also be useful to understand how its location in "real space" relates to the indices in the variable Image.

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