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Re: Octave equivalent to A = mxGetPr(prhs[0]);

From: David Bateman
Subject: Re: Octave equivalent to A = mxGetPr(prhs[0]);
Date: Fri, 09 Jun 2006 11:30:38 +0200
User-agent: Mozilla Thunderbird 1.0.6-7.6.20060mdk (X11/20050322)

Fredrik Lingvall wrote:

>Hi all,
>I want to get a pointer to an input parameter (a large matrix) in an octave
>DLD-function (oct file) without making a copy of the input data. In a 
>mex-file I would do,
>A_M = mxGetM(prhs[0]);
>A_N = mxGetN(prhs[0]);
>A = mxGetPr(prhs[0]);
>to get the matrix size and a pointer to the data.  For octave, I have tried
>A_M = args(0).matrix_value().rows();
>A_N = args(0).matrix_value().cols();
>A = args(0).matrix_value().fortran_vec();
>A_M and A_N get the correct values but the pointer A do not seem to 
>point to the data.
>What am I doing wrong here?


const Matrix Am = args(0).matrix_value();
const double *A = Am.fortran_vec();
octave_idx_type A_M = A.rows();
octave_idx_type A_N = A.cols();


David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
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