Casadi 3.4 with Octave 4.2.2:

[Dave Goel]

Casadi 3.4 with Octave 4.2.2:

I feel so silly asking this. Debian stretch-backports updated my octave to 4.2.2 [I know, I should have checked!] and casadi stopped working properly.

I can't seem to figure out how to get octave's  4.2.1 package from backports.

And, with casadi (3.4), I get weird errors:

octave:4> MX(1,2)

error: invalid assignment to cs-list outside multiple assignment

error: called from

    MX at line 111 column 21

[Joris Gillis]

Ouch, I didn't expect our interface to depend so closely on octave version..

I'll have to investigate this.
I do suggest you continue to look for the older package, as I will not have time to look for a solution until next week..

Best regards,
  Joris

[Dave Goel]

Unfortunately, I still can't seem to figure out how to download octave 4.2.1 for stretch backports.  I feel so dumb. 

In the meanwhile, I got around the MX(2,2) problem by using stuff like MX.zeros(2,2).

But, that was a general sign of things. I keep getting weird errors simply upon trying to print some variables.  This error pops up everywhere:

error: invalid assignment to cs-list outside multiple assignment

But, the other bugs were deep inside my code. Other than the above MX(2,2) example, I can't seem to find a SSCCE/MRE of the problem. 

[Andres Codas Duarte]

Hi Joris and Dave,

   Is this issue resolved in Casadi 3.4.1?  Particularly, the default in OSX with brew is octave 4.2.2 and I cannot find an easy way to install octave 4.2.1.

   Regards,
   Andres

[Joris Gillis]

our mac builds make use of homebrew as well, so yes this is fixed. But not for linux..

[Andres Codas Duarte]

The issue persists on my OSX high sierra with octave 4.2.2 installed via brew with octave 3.4.1

Funny fact:

octave:1> a = casadi.MX(2,1)
a =

zeros(2x1,0nz)

octave:2> b = MX(2,1)

error: invalid assignment to cs-list outside multiple assignment
error: called from
    MX at line 111 column 21

The issue does not appear if you switch to octave 4.0.3 (https://sourceforge.net/projects/octave/files/Octave%20MacOSX%20Binary/2016-07-11-binary-octave-4.0.3/octave_gui_403_appleblas.dmg/download) with same configurations.
I also tested on an ubuntu machine with octave 4.2.1 and there is no problem there.

I made all the substitutions so that I use casadi.MX() but there are still inconsistencies.  I did not manage to get a minimum failing example :(

I hope this feedback somehow helps...

[Joris Gillis]

Issue fixed on develop branch.
CasADi 4.2.2 to be expected soon..

   Joris

[Joris Gillis]

I meant CasADi 3.4.2, obviously. It's out now with support for octave 4.2.2

   Joris

[Andres Codas Duarte]

Hi Joris

   I'm still facing issues on octave 4.2.2 with CasADi 3.4.2, with both linux and OSX.

   Consider the LP object:

LP.m

classdef LP

properties
    eqs
    A
end

methods
    function problem = LP(eqs)
        problem.eqs = eqs;
    end
    function n = numel(problem)
        n = numel(problem.eqs);
    end

end
end

  If I run the following script:

p = LP(1);
p.A = 1;  % ok


mx = casadi.MX.sym('mx',3,1);
p = LP(mx);
p.A = 1;  % not ok

I get:

error: invalid assignment to cs-list outside multiple assignment

on the last line.  This the minimal failing example I manage for the moment, I hope it is sufficient to help

Regards,
Andres

[Joris Gillis]

Dear Andres,

I think you just constructed an example that fails regardless of casadi (replace mx by zeros(2,1))?
If so, consider posting it to https://savannah.gnu.org/bugs/?46571 No need to mention casadi there..

Best,
Joris