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Comment #36 on issue 1337 by matt...@gmail.com: find all instances in an
expression
http://code.google.com/p/sympy/issues/detail?id=1337
This is now in master.
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Comment #35 on issue 1337 by smi...@gmail.com: find all instances in an
expression
http://code.google.com/p/sympy/issues/detail?id=1337
I updated the docstring and code a bit in c2 of my p12 branch.
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Comment #34 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
You should be able to do that. Just use two Wilds.
Those rules and patterns should be implemented in Wild, so that everything
that uses Wild (match, replace, etc.)
Comment #33 on issue 1337 by elliso...@gmail.com: find all instances in an
expression
http://code.google.com/p/sympy/issues/detail?id=1337
This is very exciting as we need this in a huge way in the quantum stuff.
Just a question, we often need to do replacements like this:
Obj1(a)*Obj2(b
Comment #31 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
It looks good. I would include an example of what map=True does in the
docstring.
Looking forward to replacing some of my risch_integrate() code with this.
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Comment #30 on issue 1337 by mattpap: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
I went ahead and implemented preliminary version of replace(), e.g.:
In [1]: f = log(sin(x)) + tan(sin(x**2))
In [2]: a = Wild('a')
In [3]: f.replace(sin(a), cos(a))
Comment #29 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
Yeah, I think he stopped working on it. His work is at
https://github.com/bastikr/sympy in the subs and match branches. Someone
should pick up where he left off.
Comment #28 on issue 1337 by Vinzent.Steinberg: find all instances in an
expression
http://code.google.com/p/sympy/issues/detail?id=1337
I like it. This way, subs() would be very basic and fast, whereas replace()
can do the advanced stuff. replace() reminds me of rewrite().
Sebastian crea
Comment #27 on issue 1337 by mattpap: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
Function should have an explicit meaning. If we realize that a function
does the job of two or more, we should split it. Adding options managers is
the option of las
Comment #26 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
Well, if subs is going to have an options manager as planned, then you
could just make the replace feature an option to subs. But like I said, I
also like having i
Comment #25 on issue 1337 by mattpap: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
subs() and replace() have different semantics. Both get two arguments, but
1. subs() gets a Basic instance, tries to find all its occurrences in an
expression and rep
Comment #24 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
Or you could just add it to subs. I like replace, though.
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Comment #23 on issue 1337 by mattpap: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
We can add replace() method with the following syntax:
expr.replace(query_or_type_or_pattern, make_it_a_little_different_function)
(or it can be find_and_replace()).
Comment #22 on issue 1337 by Vinzent.Steinberg: find all instances in an
expression
http://code.google.com/p/sympy/issues/detail?id=1337
By the way, this can be very useful for an expression rewriting function
This was actually the motivation for opening this issue. :)
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Comment #21 on issue 1337 by asmeurer: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
atoms seems to be a little slower (though not by much):
In [10]: %timeit f.atoms(tan)
1 loops, best of 3: 90.5 us per loop
In [11]: %timeit f.find(tan)
1 loop
Comment #20 on issue 1337 by smichr: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
While normal atoms can do some of what find does,
f.atoms(tan)
set([tan(1), tan(x**2), tan(tan(1 - x)), tan(1 - x)])
It can't find more general patterns so this looks
Updates:
Labels: NeedsReview
Comment #19 on issue 1337 by mattpap: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
As a side effect of my work on improving polynomial systems solver I
introduced a similar find() method in Basic (commit
2c965f0
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