Yes I had that; I thought the whole thing was too redundant.
Here is a complete entry and response:
from sympy import *
from sympy.holonomic.holonomic import from_hyper, from_meijer,
DifferentialOperators
from sympy.holonomic.holonomic import *
from sympy.integrals import laplace_transform
from sympy.abc import z, t,s,a
from sympy.holonomic.holonomic import *
x, y= symbols('x y ')
k, m, n = symbols('k m n', integer=True)
f, g, h = symbols('f g h', cls=Function)
init_printing(use_unicode=True)
--
--Response
ImportError Traceback (most recent call last)
<ipython-input-139-0bf94d2c5de2> in <module>()
1 from sympy import *
----> 2 from sympy.holonomic.holonomic import from_hyper, from_meijer,
DifferentialOperators
3 from sympy.holonomic.holonomic import *
4 from sympy.integrals import laplace_transform
5 from sympy.abc import z, t,s,a
ImportError: cannot import name from_meijer
--------------
And the suggestion in your following message works; or at least doesn't
error out.
But the attempt to:
from sympy.holonomic import DifferentialOperators, from_meijer, from_hyper
continues to fail irrespective of the ordering of from_meijer and
from_hyper.
I will check and see if that statement can be removed; perhaps it's not
needed?
Ray
On 04/13/2018 03:25 AM, Henri Girard wrote:
Sorry if I spam :
I did this is it of any help as it works in sage-8.1
from sympy import *
from sympy.holonomic.holonomic import *
from sympy.holonomic import DifferentialOperators
from sympy.abc import x
from sympy import ZZ
R, D = DifferentialOperators(ZZ.old_poly_ring(x), 'D')
HolonomicFunction(D**2 + 1, x, 0, [0, 1])
HolonomicFunction((1) + (1)*D**2, x, 0, [0, 1])
Le 13/04/2018 à 00:06, Raymond Rogers a écrit :
The sympy documentation
http://docs.sympy.org/latest/modules/holonomic/convert.html
has the function from_meiljer and I do
from sympy import *
from sympy.holonomic.holonomic import from_hyper, from_meijer,
DifferentialOperators
(I think redundant)
I get: "ImportError: cannot import name from_meijer"
Is this a versioning error or what?
As a side issue: I am trying to go from generalized hypergeometric
<-> meijerg
Is there a better way than through holomorphic?
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