#16732: Fix _maxima_init_evaled_ use, as well as translations of psi etc.
to/from
maxima.
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Reporter: nbruin | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: interfaces | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
For the bracket problem: since we are *removing* the square brackets we
CAN actually do the transformations with regexes, if we apply the
substitutions repeatedly:
{{{
sage: s="psi[psi[a](b)](c)"
sage: s=maxima_polygamma.sub('psi(\g<1>,',s);s
'psi[psi(a,b)](c)'
sage: s=maxima_polygamma.sub('psi(\g<1>,',s);s
'psi(psi(a,b),c)'
}}}
so we could have a little square-bracket replacement loop:
{{{
sold = None
while s != sold:
sold = s
s=maxima_polygamma.sub('psi(\g<1>,',s)
s=maxima_<other square bracket pattern>.sub(...,s)
s=maxima_<yet other one>.sub(...,s)
}}}
we should converge to a fixed point that is square-bracketless if our
patterns cover all legitimate uses of square brackets: If there is a
square-bracket use, there is an "innermost" one (that doesn't contain any
square bracket uses itself) and its pattern will trigger and remove it
(modifying s).
I'm not claiming this is an *efficient* way of doing it, but it can be
done with relatively mild changes to the code.
--
Ticket URL: <http://trac.sagemath.org/ticket/16732#comment:4>
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