Updates:
Status: Fixed
Comment #2 on issue 3669 by smi...@gmail.com: rsolve(F(n) + F(n - 2) + F(n
- 1),F(n)) return 0
http://code.google.com/p/sympy/issues/detail?id=3669
(No comment was entered for this change.)
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Comment #3 on issue 3671 by smi...@gmail.com: logcombine(log(x) - log(2))
doesn't work
http://code.google.com/p/sympy/issues/detail?id=3671
Sorry...only in the case of a Rational will it split off the denominator.
The reason it is not working in logcombine is that -log(2) is a Mul and is
Comment #4 on issue 3671 by asmeu...@gmail.com: logcombine(log(x) - log(2))
doesn't work
http://code.google.com/p/sympy/issues/detail?id=3671
Ah, and if it combines the coefficient into an exponent, in that case it
does go back. So maybe logcombine should work with a dummy class that
Comment #20 on issue 2015 by matt...@gmail.com: Hangs attempting to solve a
system of linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
I did some experimentation and using solve_lin_sys() from #1850 and sparse
rational functions from sparse-polys branch I was able to
Comment #21 on issue 2015 by asmeu...@gmail.com: Hangs attempting to solve
a system of linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
That's great. Aside from the basic slowdown of the dense representation for
multivariate polynomials, and the infamous expand call,
Status: Valid
Owner:
Labels: Type-Defect Priority-Medium EasyToFix
New issue 3672 by smi...@gmail.com: factorint should reject bad input
http://code.google.com/p/sympy/issues/detail?id=3672
factorint(log(42))
{3: 1}
Hmm...
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Comment #5 on issue 3671 by smi...@gmail.com: logcombine(log(x) - log(2))
doesn't work
http://code.google.com/p/sympy/issues/detail?id=3671
Also, there is no reason to disable the joining of vanilla x with 2: log(x)
- log(2) should always be the same as log(x/2), I believe, since the
Updates:
Status: Started
Comment #6 on issue 3671 by smi...@gmail.com: logcombine(log(x) - log(2))
doesn't work
http://code.google.com/p/sympy/issues/detail?id=3671
Although I haven't implemented the combining of a single vanilla term with
others, I have used what I've learned in
Status: New
Owner:
Labels: Type-Defect Priority-Medium Matrices
New issue 3673 by eumod...@gmail.com: conversion
http://code.google.com/p/sympy/issues/detail?id=3673
The null space is of dimension 2x5
It comes as a list
Converting it to a matrix results a vector instead of a list
A_s
Updates:
Summary: getting consistent output from solve until a Solution class is
available
Comment #4 on issue 3667 by smi...@gmail.com: getting consistent output
from solve until a Solution class is available
http://code.google.com/p/sympy/issues/detail?id=3667
OK, I see. When
Comment #17 on issue 3560 by smi...@gmail.com: solve() is a giant mess
http://code.google.com/p/sympy/issues/detail?id=3560
To get consistent output (until everything is rewritten some day) the
`dict=True` option will give you a list of dictionaries (see issue 3667)
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Status: Valid
Owner:
Labels: Type-Defect Priority-Medium
New issue 3674 by smi...@gmail.com: allow removal of -1 by some sort of
factoring
http://code.google.com/p/sympy/issues/detail?id=3674
Although a negative Integer can be factored out of an expression, none of
factor,
Comment #15 on issue 161 by matt...@gmail.com: writing a Mathematica parser
http://code.google.com/p/sympy/issues/detail?id=161
Last year I wrote a Mathematica parser in Scala
(https://github.com/mattpap/mathematica-parser). It supports most commonly
used syntax, but has problems with nasty
Updates:
Labels: Parsing
Comment #16 on issue 161 by asmeu...@gmail.com: writing a Mathematica parser
http://code.google.com/p/sympy/issues/detail?id=161
Cool. We will need to work out a good framework for parsers in SymPy, so
that we can have parsers for many languages without too
Comment #17 on issue 161 by matt...@gmail.com: writing a Mathematica parser
http://code.google.com/p/sympy/issues/detail?id=161
There is some documentation, but it isn't very helpful when you try to
write a parser.
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Comment #5 on issue 3017 by asmeu...@gmail.com: Eq,Ne.doit() don't do it
http://code.google.com/p/sympy/issues/detail?id=3017
Oh, I see it's just doit, not automatically. Still, it's a can of worms if
we don't have a good separation of boolean and symbolic Eq.
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Comment #1 on issue 3511 by asmeu...@gmail.com: SymPy is not
easy_installable
http://code.google.com/p/sympy/issues/detail?id=3511
Good news! There is an active discussion to completely remove the link
crawling behavior of pip/easy_install, see
Updates:
Status: Started
Comment #6 on issue 3615 by asmeu...@gmail.com: Test failure with numpy
1.7.0
http://code.google.com/p/sympy/issues/detail?id=3615
We just needed to bump up our Matrix.__array_priority__, which was set to
10. See https://github.com/sympy/sympy/pull/1846.
Comment #2 on issue 3673 by mrock...@gmail.com: Matrices of matrices
http://code.google.com/p/sympy/issues/detail?id=3673
Now, A_null is basically [matrix1, matrix2], so shouldn't it also put
matrix1 on top of matrix2?
Maybe try [[matrix1], [matrix2]]
what is that supposed to be, some kind
Comment #2 on issue 3511 by asmeu...@gmail.com: SymPy is not
easy_installable
http://code.google.com/p/sympy/issues/detail?id=3511
And for those curious about actual work being done:
https://github.com/pypa/pip/issues/818.
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Comment #22 on issue 2015 by matt...@gmail.com: Hangs attempting to solve a
system of linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
I pushed the experimental solver to sparse-polys and reduced computation
times to 0.35 and 1.1 seconds (simplified, original).
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