Re: Fast copy of buffer data into a matrix

[John Swensen]

Muthiah Annamalai wrote:
> I think theres something like a 
>
> double *val = ret_img.fortran_vec(); // in this case for Matrix,
> what I gather from looking at liboctave/Marray2.cc|h &
> liboctave/MArray-defs.h (where operator macros live).
>
> -Muthiah
>
>   
I had seen something like this after I wrote my initial email, but am 
still having problems.

I tried to make sure that ret_img is a uint8Matrix and then call 
fortran_vec(), but when I call the fortran_vec() member function, it 
wants to return a
'octave_int<unsigned char>*' rather than an 'unsigned char*'.  In order 
to speed things up by simply doing a memcpy() from the C image buffer to 
the Octave matrix, I somehow need access to the underlying 'unsigned 
char*' representation.

John