Problems with control package

[David Collins]

Hi. I have recently upgraded my installation of the control package to the 
latest version on Octave Forge, but have run into problems.

I'm running Octave 3.6.2 on on Debian Wheezy.
I have removed the Debian octave-control package, and installed the latest 
version using
octave:1> pkg install -forge control;

This seemed to succeed without errors.
octave:1> pkg describe control
---
Package name:
        control
Version:
        2.6.1
Short description:
        Computer-Aided Control System Design (CACSD) Tools for GNU Octave, 
based on the proven SLICOT Library
Status:
        Loaded


However, when I try command such as 'arx()' or 'iddata()' I get the following 
errors:

octave:5> dat = iddata(Y,U);
error: __experiment_dim__: 
/usr/lib/i386-linux-gnu/octave/packages/control-2.6.1/i486-pc-linux-gnu-api-v48+/is_matrix.oct:
 failed to load: 
/usr/lib/i386-linux-gnu/octave/packages/control-2.6.1/i486-pc-linux-gnu-api-v48+/is_matrix.oct:
 undefined symbol: _ZN3MPI8Datatype4FreeEv
error: called from:
error:   /usr/share/octave/packages/control-2.6.1/__iddata_dim__.m at line 50, 
column 3
error:   /usr/share/octave/packages/control-2.6.1/__iddata_dim__.m at line 29, 
column 9
error:   /usr/share/octave/packages/control-2.6.1/@iddata/iddata.m at line 124, 
column 14


> c++filt _ZN3MPI8Datatype4FreeEv
MPI::Datatype::Free()


Another problem is that, although 'help @lti/c2d' works as expected, the 
function itself is unrecognised.

octave:6> @lti/c2d;
error: `c2d' undefined near line 6 column 6
octave:7> c2d;
error: `c2d' undefined near line 7 column 1


I'll try to look into this myself, but if anyone has any pointers they are 
welcome.
The reason I upgraded the control package was to avail of the 'arx()', 'c2d()' 
commands, etc..

David