May be this problem is trivial (RTFM...) but:
1) Suppose I run this in the REPL:
from sage.all import *
from rkkit.RKRungeKutta import * #my code
class RK4(RungeKutta):
def __init__(self):
title="Classical Runge-Kutta 4 explicit method"
A=matrix(AA,[[0,0,0,0],[1/2,0,0,0],[0,1/2,0,0],[0,0,1,0]])
B=vector(AA,[1/6,2/6,2/6,1/6])
super().__init__(A,B,title)
then I can do:
R=RK4()
everything is ok.
2) Now, in a directory "methods" I put the same piece of code as above
in a file called "RK4.py".
I add a file __init__.py in methods/, which is:
from sage.all import *
from rkkit.RKRungeKutta import *
__all__=["RK4"]
So, I have
methods/
__init__.py
RK4.py
Now, typing:
from methods import *
R=RK4.RK4()
I get the error message:
typeError: Illegal initializer for algebraic number
How can I avoid this?
(something like putting Integer() around the elements of the list in
matrix(AA,[[0,0,0,0],[1/2,0,0,0],[0,1/2,0,0],[0,0,1,0]])
is something I want (need) to avoid).
Yours,
Thierry
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