Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 2104 by smichr: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
The ordering of args appears to depend on the hash rather than mathematical
criteria. It would be nice if it were not so
Comment #1 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
The same is true for printing order. Printing order isn't as important
when it comes to ordering on different machines, but we maybe could come up
with a hash-independent f
Comment #2 on issue 2104 by pevzi23: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
If honestly, I don't like sympy's printing order for expressions. For
example:
In [2]: x**2 - 1
Out[2]:
2
-1 + x
In [3]: (x**2 - 1)**(-1)
Out[3]:
-1
──
2
1
Comment #3 on issue 2104 by mattpap: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
This can be improved easily: either run isympy with -o lex, or in a python
interpreter issue:
In [1]: from sympy import *
In [2]: init_printing(order='lex')
In [3]: var('x'
Comment #4 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
Even with the -o lex option, there are some less than ideal printing
orderings:
In [3]: x*cos(x) + cos(x) + x**2*cos(x) + cos(x**2) + x*cos(x**2) +
x**2*cos(x**2)
Out[3]:
Comment #5 on issue 2104 by justin.y...@gmail.com: canonical ordering of
terms
http://code.google.com/p/sympy/issues/detail?id=2104
I'm a newbie at SymPy, and I must be doing something wrong. When I try to
run "python isympy.py -o lex" I get the message that isympy doesn't have an
-o opt
Comment #6 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
Yeah, I think it's only implemented in the git master so far (see
GettingTheBleedingEdge). It should be in the next release, though.
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Comment #7 on issue 2104 by justin.y...@gmail.com: canonical ordering of
terms
http://code.google.com/p/sympy/issues/detail?id=2104
Okay, that's good to know. But I found a workaround for what I need: the
LatexPrinter class has a "descending" flag that can be set, and I only need
to reve
Updates:
Cc: mattpap
Comment #8 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
Actually, the latex printer is not fixed for this, even in Mateusz's
polys12 (issue 2133), which will also be part of the next release btw.
Aaro
Comment #9 on issue 2104 by justin.y...@gmail.com: canonical ordering of
terms
http://code.google.com/p/sympy/issues/detail?id=2104
My mistake. I had defined a shortcut function to automatically set
the 'descending' flag. What I meant was the following:
Python 2.7.0 console for SymP
Comment #10 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
That should be a workaround for single variable polynomials, but this still
needs to be fixed, because there is more to the various orderings than just
reversing the order
Comment #11 on issue 2104 by matt...@gmail.com: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
I fixed this in a35aed24bd016b3fd0e4d51113373f6f33530542, so workarounds
won't be necessary anymore, e.g.:
In [1]: latex(x**2 + 1, order='lex')
Out[1]: x^{2} + 1
Comment #12 on issue 2104 by justin.y...@gmail.com: canonical ordering of
terms
http://code.google.com/p/sympy/issues/detail?id=2104
I can't find this version on git (but I'm likely doing something goofy...)
I git cloned the latest version, but the order keyword does nothing for
latex().
Comment #13 on issue 2104 by asmeurer: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
Mateusz's comment was a little misleading. He has only implemented it in
his branch, polys12. To get it, you need to do
git remote add mattpap git://github.com/mattpap/sy
Comment #14 on issue 2104 by justin.y...@gmail.com: canonical ordering of
terms
http://code.google.com/p/sympy/issues/detail?id=2104
Thanks very much; found it!
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Updates:
Status: Fixed
Owner: ---
Cc: -matt...@gmail.com
Comment #15 on issue 2104 by matt...@gmail.com: canonical ordering of terms
http://code.google.com/p/sympy/issues/detail?id=2104
This was fixed in 0.7.0.
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