Comment #14 on issue 3226 by smi...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
Here is the corrected `di` function...but it is still slower.
def di(eq, *syms):
... # find common subexpressions
... r, e = cse(eq)
Updates:
Labels: NeedsReview smichr
Comment #12 on issue 3226 by smi...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
simplification is implemented in https://github.com/sympy/sympy/pull/1998
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Comment #13 on issue 3226 by smi...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
(No comment was entered for this change.)
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Comment #9 on issue 3226 by smi...@gmail.com: high-order derivatives should
be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
I just confirmed that it's factor_terms and signsimp that are providing the
simplification:
print filldedent(factor_terms(s))
3*(3*(-b**2
Updates:
Cc: smi...@gmail.com
Comment #10 on issue 3226 by smi...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
I could be missing something here, but the pre-processing appears to take
longer than just
Comment #11 on issue 3226 by smi...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
cse(sqrt((a+c*t)**2+(x+t)*(a+c*t)**2+a*(x+t))
... )
([(x0, t + x), (x1, (a + c*t)**2)], [sqrt(a*x0 + x0*x1 + x1)])
Without preprocessing:
Comment #7 on issue 3226 by valerywe...@hotmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
what about calling cse before and after the call to diff? can cse
substitute things like eg (comment 1) g(f(x)) + h(f(x))?
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Comment #8 on issue 3226 by smi...@gmail.com: high-order derivatives should
be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
([(x0, f(x))], [g(x0) + h(x0)])
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Labels: Simplify
Comment #1 on issue 3226 by asmeu...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
If we do this right, it can also make it more efficient. The derivative of
g(f(x)) + h(f(x)) is
Comment #2 on issue 3226 by andreas.kloeck...@gmail.com: high-order
derivatives should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
Psst, csesimp is defined in the OP. :)
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Comment #3 on issue 3226 by asmeu...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
D'oh!
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Comment #4 on issue 3226 by smi...@gmail.com: high-order derivatives should
be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
It's what I posted in one of the comments, just a wrapper to running
cse on an expression but only returning the expression.
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Comment #5 on issue 3226 by asmeu...@gmail.com: high-order derivatives
should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
I'm curious how csesimp() actually simplifies the expression. Are things
just canceling in intermediate steps? Or does cse() do some
Comment #6 on issue 3226 by smi...@gmail.com: high-order derivatives should
be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
It does some fast simplifications, as I recall. You would have to
check the code to know for sure. IIRC it uses factor_terms (but I
could be
Status: Valid
Owner:
Labels: Type-Defect Priority-Medium
New issue 3226 by smi...@gmail.com: high-order derivatives should be
cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
In http://groups.google.com/group/sympy/t/9e7c4a7faa3e65b1 there was a
discussion about the
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