Hi,
I want to load the packages simplex and to_poly_solve. However, I get an error:
FAILED | The following package is not supported: simplex |
Any idea where to start to solve this error?
Markus,
I know this looks odd, but a number of 3rd party providers have asked me to confirm that to the best of my knowledge the libraries we import only have very restricted read/write access to the server file system. For this reason, the master branch of the code base will always have some restrictions on the libraries stack "supports", and this will be on the basis of a list of "allowed" libraries.
I'm really not trying to be difficult. It is your business what you do on your server, of course! If you want to change this you can edit this line:
https://github.com/maths/moodle-qtype_stack/blob/master/stack/cas/installhelper.class.php#L34
In the next version of STACK, I'm very likely to load to_poly_solver myself by default anyway. It has lots of useful stuff.
If you find other things you want, I'm very happy to review them. I'll often add them to the master branch, but note that some maxima libraries are very slow to load and other cause namespace clashes with functions, or alter the behaviour of functions. They do need careful review, especially if we add them to master.
Chris
Chris,
thank you for this hack. The simplex - package gets loaded by default (using the settings of the STACK - questiontype, checked by the CAS - testing script). But if I try to use a command, I get this error:
Unsupported keyword: maximize_lp.My code:
zf:x+y;
u1:x>=0;
u2:y>=0;
u3:3*x+2*y<=12;
u4:3*x+8*y<24;
NB:[u1,u2,u3,u4];
tans:maximize_lp(zf,NB);Is it necessary to load the simplex.mac using the stackmaxima - file?
Thank you!
Markus
In reply to Christopher Sangwin
Re: STACK - packages simplex and to_poly_solve
by Christopher Sangwin -
Markus,
I've added more comprehensive documentation on how to add support for packages, rather then just loading them on an ad-hoc basis.
https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Developer/Maxima_packages.md
This line is why your question doesn't work
https://github.com/maths/moodle-qtype_stack/blob/master/stack/cas/casstring.class.php#L216
The reason for this is explained in the docs.
Colleagues here (Edinburgh) were asking about simplex, so I've created a branch here.
https://github.com/maths/moodle-qtype_stack/tree/simplex
Note, that loading this package does cause a performance reduction in Maxima. Not catastrophic, but I did notice about a 10% increase in the time taken by the unit tests.
Chris
Thank you very much!
Markus
Chris,
unfortunately, after spending some hours of troubleshooting it does not work... What I have done:
... Changed the two files on the server
... Reinstalled the qtype_stack_simplex - Plugin (Administration -> Plugin -> ZIP - File)
The result:
It does not complain about maximize_lp, but this command does not get evaluated
I know:
... We are using the Maxima - version 5.37.2 which is buggy (we are waiting for the server migration ...)
... There is an error in the Test script:
Maxima 5.37.2 http://maxima.sourceforge.net using Lisp GNU Common Lisp (GCL) GCL 2.6.12 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) define: warning: redefining the built-in function intervalp define: warning: redefining the built-in function texnumformat Compiling /tmp/gazonk_13910_0.lsp. End of Pass 1. End of Pass 2. loadfile: failed to load /usr/share/maxima/5.37.2/share/draw/draw.lisp -- an error. To debug this try: debugmode(true);
... checked, if this command is working in the shell - maxima (OK)
Thank you for your assistance!
Markus
Argh, yes
loadfile: failed to load /usr/share/maxima/5.37.2/share/draw/draw.lispindicates that your version of Maxima doesn't have the draw packages compiled in. This is called by "distributive".
In the "Load optional Maxima libraries" (qtype_stack | maximalibraries) on the stack settings page, you should only have "simplex".
The fact some distributions do or don't have these packages is why we added in (qtype_stack | maximalibraries) so individual packages can be loaded on a server by server basis. Now simplex is on this list, users shouldn't need to mess about with the code, but you do need to figure out which packages are actually available to you.
I've checked with only the simplex package loaded, and the commands above execute.
Thank you, simplex is working know!
Markus
Just as a followup, simplex is now supported in the core of STACK. It will make its way into the next official release (in time for Jan teaching), and is in the "master" branch.
Chris
Argh, yes
loadfile: failed to load /usr/share/maxima/5.37.2/share/draw/draw.lispindicates that your version of Maxima doesn't have the draw packages compiled in. This is called by "distributive".
In the "Load optional Maxima libraries" (qtype_stack | maximalibraries) on the stack settings page, you should only have "simplex".
The fact some distributions do or don't have these packages is why we added in (qtype_stack | maximalibraries) so individual packages can be loaded on a server by server basis. Now simplex is on this list, users shouldn't need to mess about with the code, but you do need to figure out which packages are actually available to you.
I've checked with only the simplex package loaded, and the commands above execute.