Issue 1139: Description and Differentiation of vector, tensor, and
multivector fields.
http://code.google.com/p/sympy/issues/detail?id=1139
Comment #28 by [EMAIL PROTECTED]:
Code:
from sympy import *
class IF(Function):
def __new__(cls,Fstr,vars):
obj = Function.__new__(cls,Fstr,*tuple(vars))
return obj
x = sympy.symbols('x1','x2')
f = IF('f',x)
g = IF('g',x)
print 'f =',f
print 'g =',g
h = f+g
print 'h =',h
Output:
f = IF(f, x1, x2)
g = IF(g, x1, x2)
h = Traceback (most recent call last):
File "test.py", line 16, in <module>
print 'h =',h
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 681, in
__str__
return StrPrinter.doprint(self)
File "/usr/lib/python2.5/site-packages/sympy/printing/printer.py", line
48, in doprint
return self._str(self._print(expr))
File "/usr/lib/python2.5/site-packages/sympy/printing/printer.py", line
96, in _print
res = getattr(self, '_print_'+cls.__name__)(expr, *args)
File "/usr/lib/python2.5/site-packages/sympy/printing/str.py", line 44,
in _print_Add
args.sort(Basic._compare_pretty)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 490, in
_compare_pretty
r_a = a.match(p1 * p2**p3)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 1263,
in match
return pattern.matches(self, {})
File "/usr/lib/python2.5/site-packages/sympy/core/mul.py", line 429, in
matches
return AssocOp._matches_commutative(pattern, expr, repl_dict, evaluate)
File "/usr/lib/python2.5/site-packages/sympy/core/operations.py", line
135, in
_matches_commutative
d2 = pattern.matches(expr, d1, evaluate=True)
File "/usr/lib/python2.5/site-packages/sympy/core/mul.py", line 429, in
matches
return AssocOp._matches_commutative(pattern, expr, repl_dict, evaluate)
File "/usr/lib/python2.5/site-packages/sympy/core/operations.py", line
95, in
_matches_commutative
pat = pat.subs(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 920, in
subs
return self._subs_old_new(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/cache.py", line 85, in
wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 929, in
_subs_old_new
return self._eval_subs(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/mul.py", line 630, in
_eval_subs
return self.__class__(*[s.subs(old, new) for s in self.args])
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 920, in
subs
return self._subs_old_new(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/cache.py", line 85, in
wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 929, in
_subs_old_new
return self._eval_subs(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/power.py", line 203, in
_eval_subs
return self.base.subs(old, new) ** self.exp.subs(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 920, in
subs
return self._subs_old_new(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/cache.py", line 85, in
wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 929, in
_subs_old_new
return self._eval_subs(old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/function.py", line 196,
in _eval_subs
return Basic._seq_subs(self, old, new)
File "/usr/lib/python2.5/site-packages/sympy/core/basic.py", line 1012,
in _seq_subs
return self.__class__(*[s.subs(old, new) for s in args])
TypeError: __new__() takes exactly 3 arguments (4 given)
Is there a problem here?
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