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Re: Passing diagonal matrix to an *.oct function

From: Jaroslav Hajek
Subject: Re: Passing diagonal matrix to an *.oct function
Date: Fri, 6 Mar 2009 11:39:06 +0100

On Fri, Mar 6, 2009 at 11:30 AM, José Luis García Pallero
<address@hidden> wrote:
> Your method:
> const octave_diag_matrix& dmref = dynamic_cast<const octave_diag_matrix&>
> (args(0).get_rep ());
> DiagMatrix a = dmref.diag_matrix_value ();
> fails at compile time. The error is:
> error: expected initializer before ‘&’ token
> error: ‘dmref’ was not declared in this scope

You need to #include the proper header, of course. In this case,
"ov-re-diag.h". But I'm just adding the diagonal query methods, so
stay tuned.

> I can work with a trick. I can pass a column vector to my function instead a
> diagonal matrix and initialize the DiagMatrix in the oct function:
> DiagMatrix a(args(0).column_vector_value());
> Can I think that this method produces a waste of memory because the original
> array is duplicated?

No. A shallow copy will be used.  But it won't work for a rectangular
diagonal matrix.

> I suppose that diag_matrix_value_method() must be added, as matrix_value(),
> column_vector_value(), etc. They can return an error in situatios of
> conflict, like Matrix a=args(0).colum_vector_value(), for example.
> Thanks

Agreed. I'll add them.

RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic

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