On Wednesday, September 10, 2014 11:02:05 AM UTC-7, Stein William wrote:
>
> Hi,
>
> Bill Page reported this issue, which I'm copying here to the
> sage-support list, in the hopes somebody will look into it:
>
> sage: var('k, l')
> sage: f = real(cosh(sqrt(1/2*k-1/2*sqrt(k^2+4l))))
>
The problem is in this line. It should be
sage: f = real(cosh(sqrt(1/2*k-1/2*sqrt(k^2+4*l))))
in which case no problem arises. Unfortunately, 4l is valid python2 syntax,
leading to the "long" with repr "4L". Simplify_full apparently converts
this to maxima by just sending the repr over, at which point maxima's
reader chokes (because "4L" is not valid maxima syntax).
sr_to_max has no issue:
sage: from sage.interfaces.maxima_lib import *
sage: sr_to_max(SR(4L))
<ECL: 4>
sage: maxima_calculus(SR(4L))
TypeError: ECL says: THROW: The catch MACSYMA-QUIT is undefined.
If we want to support python longs in the maxima-interface we should
probably make the translator aware of them. Also note:
sage: str(4L)
'4'
sage: str(SR(4L))
'4L'
(there may be good reasons why str on SR uses __repr__ on its leafs,
though).
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