Re: Dynamic types question

[adler]

You are right, my mistake.

I was getting the nonconformant ops error when octave
was converting to matrices and doing the ops on those.
By grepping for gripe_nonconformant in liboctave, I was
able to find examples of what needs to be done.

Thanks

I wonder, however, if there are definitions of matrix
operations which return different sizes than the
tradition matrix arithmetic ones?

_______________________________________
Andy Adler,                address@hidden

On Fri, 30 Mar 2001, Paul Kienzle wrote:

> Where do you expect it to be caught?  Before the operator is called?  Can't
> do that since you may be defining some weird sort of operator for your new
> type which does not require conformant ops.  The error message you are
> seeing for + seems to be coming from liboctave.  Are you automatically
> promoting sparse to full for + but not for .*?  Obviously yes otherwise
> your sparse_ops code would never be called and you would not see the
> assert.  As indeed should be the case, since .* with a sparse is
> guaranteed to produce a sparse of at least the same shape as your sparse,
> and possibly sparser.
> 
> - Paul
> 
> On Thu, Mar 29, 2001 at 11:43:01PM -0500, address@hidden wrote:
> > While I've been writing my sparse functions,
> > I've noticed that octave does not prevent
> > you from nonconformant args for multiplication
> > like it does for addition.
> > 
> >    octave-2.1.32:1> a=eye(3);
> >    octave-2.1.32:2> b=sparse(eye(4));
> >    octave-2.1.32:3> a+b
> >    error: operator +: nonconformant arguments (op1 is 3x3, op2 is 4x4)
> >    error: evaluating binary operator `+' near line 3, column 2
> > 
> > Good - octave protects us here
> > 
> >    octave-2.1.32:3> a.*b
> >    octave-2.1.32: sparse_ops.cc:635: class octave_value
> >    oct_binop_f_s_el_mul(const class octave_value &,
> >       const class octave_value &): Assertion `Anr == Bnr' failed.
> >    panic: Aborted -- stopping myself...
> > 
> > Problem - no protection here - my assert is catching the error   
> > 



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