#7512: fast_callable should respect the variable order in callable symbolic
expressions (treating them like lambda functions rather than like
expressions)
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Reporter: jason | Owner: was
Type: defect | Status:
needs_review
Priority: major | Milestone:
sage-4.4.3
Component: graphics | Keywords:
Author: Robert Bradshaw, Tim Dumol, Jason Grout | Upstream: N/A
Reviewer: Ross Kyprianou | Merged:
Work_issues: |
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Comment(by kcrisman):
>
> > 2. Why did you decide again that 1 and 3 should be different from 2
and 4? I'm just curious, since this seems VERY counter-intuitive to me,
since we go to the trouble of having g(x=1,y=2)==g(y=2,x=1) for callable
guys and not allowing other variable names in them (this came up in the
PREP workshop from a user question).
>
>
> We do allow other variable names in callable expressions:
>
> {{{
> sage: f(x,y)=a*x+y
> sage: f(1,2)
> a + 2
> sage: f(a=2)
> 2*x + y
> }}}
>
I meant that we aren't allowed to use another variable name to substitute
for x and y, but rossk's examples indicate you can do this somehow (?) now
since the variables are ignored.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7512#comment:12>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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