Comment #160 on issue 1694 by smichr: solve has many issues with fractions
http://code.google.com/p/sympy/issues/detail?id=1694
The branch is 1694.
Thanks for the problem, Aaron. This flushed up some more errors. Now, all
four solution sets have the same first solution that is equivalent to w
Comment #3 on issue 2100 by smichr: nsimplify rarely works without setting
the tolerance flag
http://code.google.com/p/sympy/issues/detail?id=2100
It's not hard if you take the str() of it which generally does rounding to
get rid of spurious 9.. and ..01 and check the number of digits that
Updates:
Cc: ondrej.certik
Comment #7 on issue 983 by smichr: improvement to solve()
http://code.google.com/p/sympy/issues/detail?id=983
As of 1694:
I,v,V = symbols('IvV')
i = I*(exp(v/V) - 1)
k = i.diff(v,2)/(1 + (i.diff(v))**2)**Rational(3,2)
dk = k.diff(v)
solve(dk, v)
[-oo, V*log(
Comment #2 on issue 1363 by smichr: solve(-3*a/x**(S(1)/2), x) fails
http://code.google.com/p/sympy/issues/detail?id=1363
In mods of issue 1694:
solve(-3*a/x**(S(1)/2), x)
[]
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Comment #5 on issue 1364 by smichr: simple equations involving log()
http://code.google.com/p/sympy/issues/detail?id=1364
In mods of 1694:
solve(log(a**(-3) - x**2)/a, x)
[(1 - a**3)**(1/2)/a**(3/2), -(1 - a**3)**(1/2)/a**(3/2)]
solve(1 - log(a + 4*x**2), x)
[-(-4*a + 4*E)**(1/2)/4, (-4*a
Comment #14 on issue 1365 by smichr: improve solve
http://code.google.com/p/sympy/issues/detail?id=1365
In mods of 1694:
solve((1 - x)**2*exp(a*x), x)
[-oo, 1]
solve((1 - x)**2*exp(a*x), x)
[-oo, 1]
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Comment #4 on issue 1367 by smichr: solve(exp(x)/(8*(a + x)**2), x) fails
http://code.google.com/p/sympy/issues/detail?id=1367
Mods of issue 1694 give:
solve(exp(x)/(8*(a + x)**2), x)
[-oo]
solve(1/log(a*x), x)
[]
solve(exp(x), x)
[-oo]
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Comment #1 on issue 1368 by smichr: solve((a**2 + 1) * (sin(a*x) +
cos(a*x)), x) fails
http://code.google.com/p/sympy/issues/detail?id=1368
With mods of issue 1694:
solve((a**2 + 1) * (sin(a*x) + cos(a*x)), x)
[-I*log(I*(1/(1 - I))**(1/2)*(1 + I)**(1/2))/a, -I*log(-I*(1/(1 -
I))**(1/2)*(1
Comment #3 on issue 1380 by smichr: solve(2*x/(x+2)-1,x) gives error
http://code.google.com/p/sympy/issues/detail?id=1380
Mods of issue 1694 give
solve(2*x/(x+2)-1,x)
[2]
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Comment #5 on issue 1387 by smichr: solve(x+sqrt(x)-2,x) returns wrong
solution
http://code.google.com/p/sympy/issues/detail?id=1387
Mods of issue 1694 give
solve(x+sqrt(x)-2,x)
[1]
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Comment #3 on issue 1397 by smichr: solve fails for a sum of two fractions
http://code.google.com/p/sympy/issues/detail?id=1397
Mods of issue 1694 give:
solve((x**2/(7-x)).diff(x))
[0, 14]
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Comment #5 on issue 1398 by smichr: solve(1/(5+x)**(S(1)/5)-9, x) fails
http://code.google.com/p/sympy/issues/detail?id=1398
With mods of issue 1694:
solve(1/(5+x)**(S(1)/5)-9, x)
[-295244/59049]
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Comment #3 on issue 1572 by smichr: solve() should be able to solve
expressions where variable only appears once
http://code.google.com/p/sympy/issues/detail?id=1572
Mods of issue 1694 give:
solve((2**exp(y**2/x) + 2)/(x**2 + 15), y)
[x**(1/2)*log(1 + pi*I/log(2))**(1/2), -x**(1/2)*log(1 +
Comment #1 on issue 1596 by smichr: solve returns unnecessary 0 solution
http://code.google.com/p/sympy/issues/detail?id=1596
Mods of issue 1694 give:
solve((3 - 5*x/f(x))*f(x), f(x))
[5*x/3]
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Comment #8 on issue 1863 by smichr: nonlinear solver example stopped working
http://code.google.com/p/sympy/issues/detail?id=1863
Mods of issue 1694 also give:
solve([f_1, f_2, f_3], x, y, z)
[(-1 - 2**(1/2), -1 - 2**(1/2), 2 + 2**(1/2) - (1 + 2**(1/2))**2), (0, 0,
1), (0, 1, 0), (-1 + 2**(1
Comment #9 on issue 1863 by mattpap: nonlinear solver example stopped
working
http://code.google.com/p/sympy/issues/detail?id=1863
But we definitely need to get the new polys in place. Perhaps during
winter break
we can get this in?
Yeah, this should be finally done. Currently I'm too bu
Comment #4 on issue 2100 by asmeurer: nsimplify rarely works without
setting the tolerance flag
http://code.google.com/p/sympy/issues/detail?id=2100
I thought Real kept track of that information somewhere.
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Comment #161 on issue 1694 by Vinzent.Steinberg: solve has many issues with
fractions
http://code.google.com/p/sympy/issues/detail?id=1694
Let's start a new one, this one is already huge, and I think you fixed the
fraction issue.
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Status: Started
Owner: smichr
Comment #3 on issue 1363 by Vinzent.Steinberg: solve(-3*a/x**(S(1)/2), x)
fails
http://code.google.com/p/sympy/issues/detail?id=1363
(No comment was entered for this change.)
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Updates:
Status: Started
Owner: smichr
Comment #6 on issue 1364 by Vinzent.Steinberg: simple equations involving
log()
http://code.google.com/p/sympy/issues/detail?id=1364
(No comment was entered for this change.)
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Comment #8 on issue 983 by asmeurer: improvement to solve()
http://code.google.com/p/sympy/issues/detail?id=983
So should this issue (and the others you edited recently) be marked as
blocked on issue 1694?
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Updates:
Status: Started
Owner: smichr
Comment #15 on issue 1365 by Vinzent.Steinberg: improve solve
http://code.google.com/p/sympy/issues/detail?id=1365
(No comment was entered for this change.)
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Updates:
Status: Started
Owner: smichr
Comment #5 on issue 1367 by Vinzent.Steinberg: solve(exp(x)/(8*(a + x)**2),
x) fails
http://code.google.com/p/sympy/issues/detail?id=1367
(No comment was entered for this change.)
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Comment #162 on issue 1694 by nicolas.pourcelot: solve has many issues with
fractions
http://code.google.com/p/sympy/issues/detail?id=1694
Yes, I think the fraction issue is solved for a long time now, and huge
changes are much more difficult to review.
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Comment #2 on issue 1368 by asmeurer: solve((a**2 + 1) * (sin(a*x) +
cos(a*x)), x) fails
http://code.google.com/p/sympy/issues/detail?id=1368
I think it is zero. cos(I*x) == cosh(x) and sin(I*x) == sinh(x). If you
do this, replace it with the exp definitions, and reduce the logs, you will
Updates:
Status: Started
Owner: smichr
Comment #3 on issue 1368 by Vinzent.Steinberg: solve((a**2 + 1) * (sin(a*x)
+ cos(a*x)), x) fails
http://code.google.com/p/sympy/issues/detail?id=1368
It is zero:
In [16]: e.rewrite(exp).simplify().expand().cancel()
Out[16]: 0
But the s
Updates:
Status: Started
Owner: smichr
Comment #4 on issue 1380 by Vinzent.Steinberg: solve(2*x/(x+2)-1,x) gives
error
http://code.google.com/p/sympy/issues/detail?id=1380
(No comment was entered for this change.)
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Updates:
Status: Started
Owner: smichr
Comment #6 on issue 1398 by Vinzent.Steinberg: solve(1/(5+x)**(S(1)/5)-9,
x) fails
http://code.google.com/p/sympy/issues/detail?id=1398
(No comment was entered for this change.)
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Status: Accepted
Owner:
Labels: Type-Defect Priority-Medium
New issue 2103 by Vinzent.Steinberg: fix sympy's internal dependencies
http://code.google.com/p/sympy/issues/detail?id=2103
I used snakefood [1] to generate a dependency graph, see the attached pdf.
Attachments:
sympy-depe
Comment #7 on issue 2015 by smichr: Hangs attempting to solve a system of
linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
On my fairly modest system this takes about 16 seconds to do with the code
appended below:
for k,v in soln.items():
... print k, v.count_o
Comment #1 on issue 2103 by ondrej.certik: fix sympy's internal dependencies
http://code.google.com/p/sympy/issues/detail?id=2103
Not very readable to me. But looks quite complex. :)
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Comment #4 on issue 1368 by asmeurer: solve((a**2 + 1) * (sin(a*x) +
cos(a*x)), x) fails
http://code.google.com/p/sympy/issues/detail?id=1368
I have a much simpler and more powerful trigsimp() using .rewrite(exp) in
the works
I look forward to seeing that! There's also the approach by Fu
Comment #8 on issue 2015 by asmeurer: Hangs attempting to solve a system of
linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
It seems like that sort of thing would be easier to do using Matrix
operations.
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Comment #2 on issue 2103 by asmeurer: fix sympy's internal dependencies
http://code.google.com/p/sympy/issues/detail?id=2103
Wow! Can you remove the tests? I think those may be taking up a big
chunk. Remove Pyglet and mpmath too. I think (hope) it should become a
little more readable at
Comment #9 on issue 2015 by smichr: Hangs attempting to solve a system of
linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
In theory, it seems.
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Updates:
Cc: asmeurer
Comment #10 on issue 2015 by smichr: Hangs attempting to solve a system of
linear equations
http://code.google.com/p/sympy/issues/detail?id=2015
I checked this in t2 which uses traditional Matrix methods and it takes
only 4X longer (60 seconds) rather than hang
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