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

[David Bateman]

Fredrik Lingvall wrote:

> David Bateman wrote:
>
>>
>>>   A[0] = 1.0;
>>>    
>>>
>>
>>You are modifying the data, and so a copy will be made if you don't mark
>>it as const.
>>
>>Regards
>>David
>>
>>  
>>
> Thanks!
>
>  const Matrix tmp = args(0).matrix_value();
>   //A_M = mxGetM(prhs[0]);
>   A_M = tmp.rows();
>   //A_N = mxGetN(prhs[0]);
>   A_N = tmp.cols();
>   //A = mxGetPr(prhs[0]);
>   A = (double*) tmp.fortran_vec();
>
> Solved my problem.

Yes, but the last line probably made a copy of the data with this last
line with the cast to (double *)!! Try adding A.print_info() after and
see what value rep->count has... If it is "1" you've made a copy..

D.


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