[Pymat-users] pymat 3d support

[Tal T. <ta...@cs...>]

At some point about a year ago I tried fixing the 2-d limitation and
managed to get a version working that took arbitrary dimensional
arrays.  I don't remember how I did it exactly, but it wasn't
difficult.  Basically I read the documentation on how both Matlab and
python stored their arrays and figured out a way to change the code so
that you were transferring the array information instead of the array
dimension by dimension.  I believe both array representations
basically use a large flat array that stores the N-dimensional array
content and then a set of variables that store the information about
the number and size of the dimensions.

I never tested the code much or else I would have checked it back in.
By now, it's too late because the code base has changed too much from
the code that I originally altered.

Please let us know if you fix this.  Also, I'd be happy to help and to
send you my old code.

Cheers,
Tal Tversky
ta...@cs...

Rolv Erlend Bredesen writes:
 > Hi Guys,
 > I want the "rank > 2 arrays" limitation fixed.
 > If some of you have good hints I can look into it.
 > 
 > Sincerely Rolv
 > 
 > 
 > ---------- Forwarded message ----------
 > Date: Mon, 18 Oct 2004 10:25:55 -0400
 > From: Andrew Sterian <ste...@cl...>
 > To: ro...@st...
 > Subject: Re: pymat 3d support
 > 
 > Hi Rolv,
 > 
 > I don't really know how MATLAB works with higher dimension
 > arrays. I also haven't really used the python-MATLAB connection
 > in a long time. There is a new project on Sourceforge now
 > at http://sourceforge.net/projects/pymat that has some developers
 > that may be more informed.
 > 
 > ro...@st... wrote:
 > > Hi Andrew.
 > > I'm using python a  lot for numerical computing.
 > > Especially using matlab as a backend for plotting has been very useful.
 > >
 > > Now I want to fix this limitation of pymat:
 > >
 > > """
 > > The following limitations apply to the current version of PyMat:
 > >    1. Only 1-D and 2-D double-precision (real or complex) MATLAB arrays
 > > are supported (and single character strings). Matrices of higher
 > > dimension, structure arrays, cell arrays, etc. are not yet supported.
 > > """
 > >
 > > So I wonder if you could give me some hints on sending 3D, 4D and larger
 > > arrays into matlab through pymat.
 > >
 > > (know about the reshape/flatten trix)
 > >
 > > I already understand most of the code and have compiled it myself.
 > >
 > > Sincerely Rolv