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Comment #19 on issue 1172 by smi...@gmail.com: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
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Comment #18 on issue 1172 by smi...@gmail.com: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
With https://github.com/sympy/sympy/pull/1964, the last remaining equation
solves:
solve((a/x + exp(x/2)).diff(x,2),x)
[6
Comment #17 on issue 1172 by smi...@gmail.com: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Pull 656 has been merged. The remaining problems are desribed in comment 16.
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Comment #16 on issue 1172 by smi...@gmail.com: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
All but two of the curve sketching tasks complete, now, with
https://github.com/sympy/sympy/pull/656 . The two that don't complete are
the 2nd derivatives of x**x and
Comment #15 on issue 1172 by smi...@gmail.com: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
The current solvers fails with multiple generators for several of these
(see attached) and hangs unless check=False for the maxima and inflections
of f20. I think fact
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Labels: Solvers
Comment #14 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
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Comment #13 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
The isinstance(f, Mul): ... stuff should be the first thing that solve()
checks for.
The recursive factorization could be made optional if it's too slow. Or
guess_solve
Comment #11 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
I implemented simple a solver that tries to factorize the expression to get
a product
which is easy to solve. It's able to solve some equations the current
solver can
Comment #10 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Thanks you too!
For the record, here is the list:
http://code.google.com/p/sympy/issues/list?q=label:Solvers
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Comment #9 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Thank you, Ondrej!
Added many functions, opened a lot of issues.
Attachments:
graph.py 3.2 KB
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Comment #8 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Patches are in. Let's open new issues for all things that still don't work.
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Comment #7 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
It doesn't solve all the problems with the graph.py, but it shows how to
approach it.
If you have time Vinzent -- could you please open an issue for each
equation that
sym
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Comment #6 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
I fixed it:
In [1]: var("x y a")
Out[1]: (x, y, a)
In [2]: f = 4*x*(1 - a*x**(S(1)/2))
In [3]: solve(f, x)
Out[3]
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Comment #5 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Bisecting on the following code:
from sympy import *
var("x y a")
f = 4*x*(1 - a*x**(S(1)/2))
print solve(f, x)
re
Comment #4 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Sympy regressed and fails to find some simple roots:
graph discussion for f(x) = -9*x + x**3
f is symmetric to point of origin.
limes for x -> oo: oo
limes for x -> -oo:
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Comment #3 on issue 1172 by Vinzent.Steinberg: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
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Comment #2 on issue 1172 by ondrej.certik: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
This is in, thanks!
http://git.sympy.org/?p=sympy.git;a=commit;h=e6becad22a44725ae04a2976552e16aa8fff9827
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Comment #1 on issue 1172 by robert.kern: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
Hmm, current sympy appears to have regressed. It now also chokes on 4*x*(1 -
a*x**(1/2)). guess_solve_strategy() incorrectly returns GS_POLY
Issue 1172: example: curve sketching
http://code.google.com/p/sympy/issues/detail?id=1172
New issue report by Vinzent.Steinberg:
It's a common task for German high school students to do a so called curve
sketching, which means basically analyzing a function f(x) using
derivatives and stuff. This
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