Hi Aaron Meurer,
Yes, I have used :
map(lambda var : diff(var,t), [cos(t), sin(t), t])
without problems and suggested it to my students because it works in
more versions of SymPy.
I have followed your link and verified that other functions, like
'sin', aren't anymore 'listable'. So it isn't only 'diff'.
Best regards,
Roberto
Em 08-11-2011 22:18, Aaron Meurer escreveu:
This probably wasn't intended, but I don't think we will fix it. See
the discussion at
http://code.google.com/p/sympy/issues/detail?id=2622. If you want to
apply the operation over a list, you should use map() or a list
comprehension.
Aaron Meurer
On Tue, Nov 8, 2011 at 5:15 PM, Roberto Colistete Jr.
<[email protected]> wrote:
Hi,
On SymPy 0.6.7 the 'diff' function works on lists. But on SymPy
0.7.1 it doesn't, for example :
In [1]: diff([cos(t), sin(t), exp(t), t)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/roberto/<ipython-input-6-14d9fa9d6a32> in<module>()
----> 1 diff([cos(t),sin(t),t],t)
/usr/local/lib/python2.6/dist-packages/sympy/core/function.pyc in
diff(f, *symbols, **kwargs)
1104 """
1105 kwargs.setdefault('evaluate', True)
-> 1106 return Derivative(f, *symbols, **kwargs)
1107
1108 def expand(e, deep=True, modulus=None, power_base=True,
power_exp=True, \
/usr/local/lib/python2.6/dist-packages/sympy/core/function.pyc in
__new__(cls, expr, *symbols, **assumptions)
672 if evaluate:
673 if set(sc[0] for sc in symbol_count
--> 674 ).difference(expr.free_symbols):
675 return S.Zero
676
AttributeError: 'list' object has no attribute 'free_symbols'
This is a new feature or a bug ?
'integrate' works on lists, by the way.
Thanks in advance,
Roberto
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