Re: [Lapackpp-devel] assert(cI.end() >= 0) (was: Interesting crash in QR solve)

[Do bi <mrc...@ya...>]

Hi friends,
   I succeeededb in compliling the lapack++ proj file in vc++.
   Since there are no hands-on tutorials on lapach++, please just state briefly how the simplex code can be written: Say I need a small matrix and a small vector and I want to multiply, display, and solve LU.
  Thanks

Christian Stimming <sti...@tu...> wrote:
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Dear Michael,

thank you for your nice feedback. I'd happily try to fix these bugs,
although I probably need some assistance to track them down. I'll reply
to both bugs in individual posts; first this one:

Michael Price schrieb:
> situations: printing out matrices, and linear systems solution. (I 
> don't remember seeing the problem when using LU, only QR and SVD.) 
> First, sometimes the assertion
> 
> assert(cI.end() >= 0); (mtmpl.h, line 279)
> 
> fails.

This assertion should only be reached when you used negative increments
for a submatrix index; do you really use negative increments? I would
certainly agree that several functions have never been tested with
negative increments, only with positive ones, so there can very well be
a bug in there. The assertion is perfectly valid and if it fails then it
means that probably somewhere else some code is wrong if the increments
are negative (instead of positive). Could you submit a code snippet that
crashes with that assertion? Thanks.

Christian
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