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| 2013-03-14 14:16:28 +0200 | commented answer | The difference between f(x=3) and f(3) of callable symbolic expression 'f' Inspired by your answer. I finally found that if no keywords was specified, f(3) will call variables() method to make a dict to pass to sage.symbolic.expression.Expression.subs method. It is the subs method do the actual work. So when varibles() return None, the dict cannot be made, an error was raised. The code is in Line 683 of /devel/sage/sage/symbolic/ring.pyx |
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| 2013-03-14 11:06:52 +0200 | asked a question | The difference between f(x=3) and f(3) of callable symbolic expression 'f' f=x.derivative() f(3) ----> error f(x=3) ----> ok! Dose f(x=3) call the method __call__? |
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