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Topic: spdiags() “Index exceeds matrix dimensions.”ask for help??
Replies: 1   Last Post: Nov 18, 2012 11:53 PM

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Steven Lord

Posts: 18,038
Registered: 12/7/04
Re: spdiags() “Index exceeds mat
rix dimensions.”ask for help??

Posted: Nov 18, 2012 11:53 PM
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"dfd ssss" <> wrote in message
> I just want to form a block tridiagonal matrix(DOWN is sub M in the
> middle,UP is sup),however, every time I used spdiags() ,it gave me a
> message ?Index exceeds matrix dimensions.?,I don't know why and I'm a
> beginner of matlab,hopefully, someone can give me a hand,thank you very
> much!

Set an error breakpoint then run your code. MATLAB will stop on the line
where the error occurs. Look at all the variables into which you're indexing
on that line and the indices you're using and see which indices are too

*snip code*

Steve Lord
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