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

[David Bateman]

Fredrik Lingvall wrote:

> David Bateman wrote:
>
>>
>>> 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.
>>
>>  
>>
> I did  a A[0] = 0.0; and the 1st element of the input parameter was
> changed to 0 after I
> called my oct-file so I think that it worked. But anyway, how do you
> suggest that I should
> write the code?
>
> Fredrik

Ok, but it goes against the conventions of octave/matlab in that all
arguments are considered as pass by value. So use at your own risk...

D.


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