Updates:
Status: Accepted
Comment #1 on issue 2107 by asmeurer: Real(0.1, 10) - Real(0.1, 10) ->
3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
I get the same thing in master. I don't know if this is something that can
be fixed, or if it is just one of those
Status: Accepted
Owner: asmeurer
CC: mattpap
Labels: Type-Defect Priority-Medium Polynomial
New issue 2108 by asmeurer: 3/2*x/(y + 1) - z in QQ[x, y, z] failure
http://code.google.com/p/sympy/issues/detail?id=2108
In [3]: 3/2*x/(y + 1) - z in QQ[x, y, z]
Comment #5 on issue 2075 by asmeurer: solve fails for eq1=1 + 2*y/b - (e +
x)**2/a; eq3=1 + 2*y/d - (x - e)**2/c
http://code.google.com/p/sympy/issues/detail?id=2075
Those are used internally by Poly to determine what the coefficients of a
polynomial come from. ZZ means the integers and QQ
Comment #2 on issue 2107 by fredrik.johansson: Real(0.1, 10) - Real(0.1,
10) -> 3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
There is definitely something fishy going on here. Note
a = Real(0.1,1)
a - a
-4.e-4
a + (-a)
0
THIS LINE WAS ADDED TO THIS COMMENT BECAU
Comment #11 on issue 2106 by ronan.l...@gmail.com: Matrix of shape (1,1)
and a number can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
I'm not sure what exactly is the suggestion here, but in any case 1*1
matrices shouldn't be handled specially. Also, I don't think there'
Comment #13 on issue 388 by ronan.l...@gmail.com: NotImplementedError in
matrices
http://code.google.com/p/sympy/issues/detail?id=388
The NotImplementedError is because Matrix isn't a subclass of Basic and
behaves quite differently (instances are mutable, no .args attribute, ...).
Having
Comment #12 on issue 2106 by Vinzent.Steinberg: Matrix of shape (1,1) and a
number can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
Well, you could define the addition componentwise, this makes sense. And
this is what numpy/mpmath are doing.
I thinks it's fine to let th
Updates:
Labels: -EasyToFix
Comment #14 on issue 388 by asmeurer: NotImplementedError in matrices
http://code.google.com/p/sympy/issues/detail?id=388
What about creating an ImmutableMatrix class to allow this to work? We
already need to refactor Matrix so that it is like Polys where t
Updates:
Cc: fredrik.johansson
Comment #3 on issue 2107 by asmeurer: Real(0.1, 10) - Real(0.1, 10) ->
3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
The only thing that I can see that is being called differently there is
that Real has __add__ defined but not _
Comment #4 on issue 2107 by asmeurer: Real(0.1, 10) - Real(0.1, 10) ->
3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
Actually, we also need to figure out what makes it go wrong in Add and fix
it there too, so that explicitly calling Add(Real(0.1, 10), -Real(0.1, 10))
Comment #13 on issue 2106 by mipavelka: Matrix of shape (1,1) and a number
can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
Well, I think that if SymPy distinguishes between 1x1 matrices and scalars,
the Matrix.trace() function, for example, should be redefined. Because t
Comment #14 on issue 2106 by asmeurer: Matrix of shape (1,1) and a number
can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
There is a mathematical difference. For example, 3*Matrix([[1, 2, 3], [4,
5, 6], [7, 8, 9]]) makes sense, but Matrix([3])*Matrix([[1, 2, 3], [4, 5,
Comment #15 on issue 2106 by ronan.l...@gmail.com: Matrix of shape (1,1)
and a number can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
The problem with defining addition componentwise is that you'd expect (1 +
X) * Y = Y + X*Y.
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Comment #16 on issue 2106 by Vinzent.Steinberg: Matrix of shape (1,1) and a
number can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
The problem with defining addition componentwise is that you'd expect (1
+ X) * Y = Y + X*Y.
Why? It's clear in Python that 1 cannot be th
Status: New
Owner:
Labels: Type-Defect Priority-Medium
New issue 2109 by huahai.yang: GA SymPy module not work embeded
http://code.google.com/p/sympy/issues/detail?id=2109
I am learning Geometric Algebra and would like to use the SymPy GA module.
Using the module in a python REPL is fine,
Comment #5 on issue 2107 by smichr: Real(0.1, 10) - Real(0.1, 10) ->
3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
cf issue 2105
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