On Wednesday, January 21, 2015 at 2:39:52 AM UTC-8, Snark wrote:
>
>
> Ah, ha! That helps. But, let's take the following code (extracted from
> src/sage/interfaces/maxima_lib.py) :
>
> from sage.libs.ecl import *
>
> ecl_eval("(require 'maxima)")
> ecl_eval("(in-package :maxima)")
> ecl_eval("#$load(abs_integrate)$")
>
> it gives me:
> RuntimeError: ECL says: THROW: The catch MACSYMA-QUIT is undefined.
>
And obviously, maxima_lib.py doesn't suffer from this problem, because the
code there executes quite frequently without this error. Apparently there
is something different between what you do and what happens in
maxima_lib.py. Indeed, there is more code in maxima_lib.py. Right below the
(in-package :maxima) we have:
(defvar *MAXIMA-LANG-SUBDIR* NIL)
(set-locale-subdir)
(set-pathnames)
and then load works. Maxima needs more initialization than requiring the
package. A large part of maxima was already written before the CL standard
was made and before packages were introduced, so it has a lot of archaic
bits to the code. It certainly was never designed to be used as a lisp
library, so you need to jump through odd hoops to get it to work as such.
It may also be possible that maxima does have a better initialization
routine that has everything packaged in, but I wasn't able to find it (and
reverse engineering what WAS needed took quite a bit of trial and error).
Concerning the THROW: Maxima has its own error signalling mechanism that
requires a guard on the stack to CATCH the THROWs.
To put an appropriate catch in place, maxima_lib defines maxima-eval, which
is hugely improved in:
http://trac.sagemath.org/ticket/14308
I was fully expecting that ticket to be merged already, but apparently
no-one cares about the issue there. It's still worth merging the much
simpler implementation of maxima-eval, though.
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