Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium
New issue 2134 by asmeurer: Derivative of Lambda does not work
http://code.google.com/p/sympy/issues/detail?id=2134
There is a bug with diff and Lambda:
In [31]: Lambda(z, z*log(x - z)).diff(x)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/Users/aaronmeurer/Documents/Python/sympy/sympy/<ipython console> in
<module>()
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/expr.py in
diff(self, *symbols, **assumptions)
859 if not "evaluate" in assumptions:
860 assumptions["evaluate"] = True
--> 861 ret = Derivative(self, *new_symbols, **assumptions)
862 return ret
863
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/function.pyc in
__new__(cls, expr, *symbols, **assumptions)
583 if not expr.has(s):
584 return S.Zero
--> 585 obj = expr._eval_derivative(s)
586 if obj is None:
587 unevaluated_symbols.append(s)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/function.pyc in
_eval_derivative(self, s)
274 continue
275 if isinstance(self.func, FunctionClass):
--> 276 df = self.fdiff(i)
277 l.append(df * da)
278 return Add(*l)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/function.pyc in
fdiff(self, argindex)
449 nargs = self.nargs
450 if not (1<=argindex<=nargs):
--> 451 raise TypeError("argument index %r is out of range
[1,%s]" % (argindex,nargs))
452 return Derivative(self,self.args[argindex-1],evaluate=False)
453
TypeError: argument index 2 is out of range [1,1]
See issue 2132.
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