Re: negative indeces found by "find"

[David Bateman]

Levente Torok wrote:
> Hi David,
>
> This seems to be an index overflow.
> I uploaded the matrix here:
> <URL deleted
> Let me know if you have downloaded. I need to delete it.
>
> Thanks,
> Lev
>   

Ok I've downloaded the file and I can reproduce this, but its not a bug
as such... The issue is that the size of the matrix is 101970 by 333596
and 101970*333596 is greater than 2^31 which is the larger integer index
that octave can use. So you are seeing an integer overflow.

You have two choices. Build a 64-bit version of Octave (search the list
for how to do this) or if you instead index with

[inx, iny] = find(docByWordsS);

instead the individual indices will be smaller than 2^31.. Note however
that you still might have some issues with such a large matrix without a
64-bit version of Octave, as some operations and functions might index
the matrix with a single index triggering the same issue.

D.