oct function question

[Anand Patil]

Hi everyone,

First off, a big thank you to John W. Eaton and everyone else for making 
Octave available and for putting so much time into these mailing lists! 
I'm just starting to move over from Matlab to Octave, and it's like 
escaping from prison.

OK: I'm writing lightweight oct functions that get called millions of 
times that involve nonlinear operations on matrix elements. Past 
experience with such situations in C++ indicates that the overhead from 
any function calls or indirection involved in using Matrix's get and set 
functions may add up. Is there any way to get the address of the 
underlying array out of the Matrix class, as with the mex function 
mxGetPr()?

Also: Is there any way to construct a Matrix so that it shares its 
underlying array with another Matrix? That is, is it possible to pass a 
matrix into an oct function but then work with it under a name other 
than args(i).matrix_value()?

Finally: If the functionality I'm looking for doesn't exist, which files 
would I have to edit?

Thanks,
Anand