Hello, I've been working in implementing Airy functions in sage, and
since mpmath allows calcultating any derivative or integral of Airy
functions I wanted to implement the generalized symbolic case, but I am
very puzzled by this error:
from sage.symbolic.function import BuiltinFunction
class FunctionAiryAiGeneral(BuiltinFunction):
def __init__(self,alpha):
self.alpha=alpha
BuiltinFunction.__init__(self, "airy_ai", nargs=2,
latex_name=r"\operatorname{Ai}")
def _derivative_(self, x):
return airy_ai(self.alpha+1,x)
airy_2=FunctionAiryAiGeneral(-2)
f=airy_2(-2,x)
print f
derivative(f,x)
gets me this output:
airy_ai(-2, x)
Traceback (most recent call last):
latex_name=r"\operatorname{Ai}")
File "", line 1, in <module>
File "/tmp/tmpkTtzNc/___code___.py", line 18, in <module>
exec compile(u'derivative(f,x)
File "", line 1, in <module>
File
"/home/oscar/sage/sage-4.7.1/local/lib/python2.6/site-packages/sage/calculus/functional.py",
line 130, in derivative
return f.derivative(*args, **kwds)
File "expression.pyx", line 2699, in
sage.symbolic.expression.Expression.derivative
(sage/symbolic/expression.cpp:12542)
File "derivative.pyx", line 216, in
sage.misc.derivative.multi_derivative (sage/misc/derivative.c:2207)
File "expression.pyx", line 2771, in
sage.symbolic.expression.Expression._derivative
(sage/symbolic/expression.cpp:12918)
TypeError: _derivative_() takes exactly 2 non-keyword arguments (3 given)
I did give derivative exactly 2 non-keyword arguments...
thank you
Oscar
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