#6482: [with patch, needs review] multivariate polynomial substitution has a
design flaw
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Reporter: was | Owner: malb
Type: defect | Status: new
Priority: critical | Milestone: sage-4.1.2
Component: commutative algebra | Keywords:
Reviewer: | Author:
Merged: |
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Comment(by jason):
Note that since dictionaries do not preserve order, in python, there is no
way to distinguish between {{{ {x:x+1,y:x*y} }}} and {{{ {y:x*y, x:x+1}
}}}. There are classes out there that implement ordered dictionaries, but
if the feature request depends on looping through a standard dictionary in
the order that the dictionary was specified, that seems pretty impossible.
Note that this also means that there is no distinction between these
calls: {{{ g(x=3, y=x) }}} and {{{ g(y=x, x=3) }}}.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6482#comment:6>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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