Re: Mex files oct.h and mxGetDimensions

[Quentin Spencer]

Carine Simon wrote:

> Hi,
>
> I've got some troubles trying to use some mex files. The first one is that if I
> include oct.h file, it cannot compile as it doesn't find some files such as
> cassert. In fact, I think this is because include files of octave are under
> /usr/local/include whereas C and C++ ones are under /usr/include. But I don't
> know how to precise where to find libraries.
>
> Well, I can still compile one of my functions without the oct.h. But I can't use
> it as it doesn't find mxGetDimensions.
> To try to be a bit more clear, I send you below the function I've tested:
>  
I think the fundamental problem here is that the code you are trying to 
compile is written for Matlab's C API, which is completely different 
than Octave's. In Octave, for example, you can get the dimensions of a 
matrix X using X.rows() and X.columns(). mxGetDimensions is Matlab's way 
of implementing this.

For more reading on how to write dynamically linked functions in C++ for 
Octave, I would suggest the document at: 
http://octave.sourceforge.net/coda/index.html

If you are writing new C++ code, you will need to learn Octave's 
functions for things like dimensions. If you are trying to compile code 
originally written for Matlab, you will need to rewrite portions of the 
code. In the code you attached, you have a wrapper function that 
interfaces to Matlab and a function that uses pretty much plain C as far 
as I can tell. To compile in Octave, you need to write a new wrapper 
function that interfaces to Octave, but the other function appears that 
it can remain as it is.



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