Comment #5 on issue 1551 by Toon.Verstraelen: StrPrinter is class
sympy.printing.str and instance in sympy.core.basic
http://code.google.com/p/sympy/issues/detail?id=1551
Ronan, with monkey-patching, do you mean defining new variables in a module
from
outside the module (similar for classes
Comment #14 on issue 1356 by Toon.Verstraelen: evalf(), sstr(), pretty(),
latex(), ... should raise an exception if passed wrong kwarg
http://code.google.com/p/sympy/issues/detail?id=1356
I deduced that 'n' refers to the number of digits and 'prec' refers to the
number of
bytes.
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Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 1891 by smichr: RootOf has subs problems
http://code.google.com/p/sympy/issues/detail?id=1891
Here is a RootOf instance:
r
RootOf(y**5 + 11*y - 2, y, domain='ZZ', index=4)
When one tries a substitution, an error is
Updates:
Status: Started
Owner: mattpap
Labels: Milestone-Release0.7.0 NeedsReview Polynomial
Comment #1 on issue 1891 by mattpap: RootOf has subs problems
http://code.google.com/p/sympy/issues/detail?id=1891
This issue was fixed with new RootOf implementation (see issue
Comment #1 on issue 1890 by smichr: Quartic equation solution probably not
correct
http://code.google.com/p/sympy/issues/detail?id=1890
Quartic doesn't discriminate against symbolic input even though to select
the proper
root it has to know the sign of terms (like the discriminant in quadra
Updates:
Status: Accepted
Labels: Milestone-Release0.7.0 Polynomial
Comment #2 on issue 1890 by mattpap: Quartic equation solution probably not
correct
http://code.google.com/p/sympy/issues/detail?id=1890
We will need to simplify intermediate results if input is given with
p
Status: Accepted
Owner: ondrej.certik
Labels: Type-Defect Priority-Medium
New issue 1892 by ondrej.certik: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
In [6]: var("a b")
Out[6]: (a, b)
In [7]: integrate(1/(x*(a+b*x)**3), x)
ERROR: An unexpected erro
Updates:
Owner: ---
Comment #1 on issue 1892 by ondrej.certik: integrate(1/(x*(a+b*x)**3), x)
fails
http://code.google.com/p/sympy/issues/detail?id=1892
(No comment was entered for this change.)
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Updates:
Cc: fredrik.johansson
Comment #15 on issue 1356 by Vinzent.Steinberg: evalf(), sstr(), pretty(),
latex(), ... should raise an exception if passed wrong kwarg
http://code.google.com/p/sympy/issues/detail?id=1356
I see. In mpmath, 'prec' is the number of bits (not bytes) and 'd
Status: Accepted
Owner:
Labels: Type-Defect Priority-Medium
New issue 1893 by ondrej.certik: integrate(log(x) * gamma_pdf, (x, 0, oo))
hangs
http://code.google.com/p/sympy/issues/detail?id=1893
I was trying to compute the expected value of log(x) under the gamma
distribution, but sympy h
Updates:
Summary: integrate(log(x) * x**(k-1) * exp(-x) / gamma(k), (x, 0, oo))
hangs
Labels: Integration
Comment #1 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
The indefinite i
Updates:
Labels: Integration
Comment #2 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
It used to work, before the new polys:
In [1]: var('a b');integrate(1/(x*(a+b*x)**3), x)
Out[1]: (a, b)
Out[1]:
⎛
Comment #2 on issue 1893 by mierle: integrate(log(x) * x**(k-1) * exp(-x) /
gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
But Wolfram's integration engine seems to handle it. Do you mean the
definite integral
can't be computed?
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Comment #3 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Yes. If you just do x (no limits), Maple returns the integral unevaluated.
It doesn't look like limit can handle unevaluated Integra
Comment #4 on issue 1893 by mattpap: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Things like x**k can't be handled by heuristic Risch algorithm, I'm sure
that also by
the recursive version. This is a case where int
Updates:
Status: Started
Owner: mattpap
Labels: Polynomial Milestone-Release0.7.0
Comment #3 on issue 1892 by mattpap: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
This is trivial to fix, and I will fix this soon.
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