#8734: make sage variables unique in maxima
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Reporter: jason | Owner: jason
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: interfaces | Resolution:
Keywords: | Merged in:
Authors: Jason Grout, Ralf | Reviewers: Volker Braun, Paul
Stephan | Zimmerman, Karl-Dieter Crisman
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/ticket/8734-1 | a195985c0617bf14a5d644f5c065bea896340ce4
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:54 kcrisman]:
> * In some of the sanitizing functions, you replace things like
`'_SAGE_VAR_f` with `f`, but in others you only replace the independent
variable that way. Is that because of specific examples that didn't work,
or was the context different, or... ?
It certainly was then because of specific examples. The removal of the
code I think you mean makes no difference now, however.
> * I'm wondering whether the Sage translation would have just taken care
of this in `soln.sage()`, but I guess it didn't. Was there any possible
change to the translation that could have done this, rather than getting
into the ode wrapper code directly (which makes it harder to read)? For
instance, in `desolve_laplace` we convert the `de` to Maxima (presumably
adding `SAGE_VAR`, add another `SAGE_VAR` from `f(x)` to `f(_SAGE_VAR_x)`
(I think), and then proceed to remove only the `SAGE_VAR` from the
''de''pendent variable. So... that part isn't taken care of by the
translation, but the independent variable still somehow is translated back
correctly, but not forward within `de0=de._maxima_()`? Yet in the `rk4`
types this isn't a problem, apparently.
With the above removal of superfluous code I don't see any different
behaviour in the three functions `laplace/system/rk4`. There is always the
marking of the dependent var to prepare for the call to solve. You cannot
remove this because `maxima(cmd)` does no translation, it's the low-level
call. The translation has to be done here, as far as I understand.
--
Ticket URL: <http://trac.sagemath.org/ticket/8734#comment:58>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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