On 10/1/07, Mike Hansen <[EMAIL PROTECTED]> wrote:
>
> Hey Ondrej,
>
> While the correspondence is not exact, this should be enough to work:
>
> sage: e = x*y
> sage: type(e)
> <class 'sage.calculus.calculus.SymbolicArithmetic'>
> sage: e._operands
> [x, y]
> sage: e._operator
> <built-in function mul>
> sage: e = exp(y)
> sage: e._operands
> [exp, y]
> sage: type(e)
> <class 'sage.calculus.calculus.SymbolicComposition'>
> sage: var('z')
> z
> sage: f = x+y*z
> sage: f._operands
> [x, y*z]
> sage: (y*z)._operands
> [y, z]
> sage: sin(y*z)._operands
> [sin, y*z]
Thanks a lot. BTW, how can I test the e._operator to be add? The only
way I discovered is this:
sage: str((x+y)._operator).find("add") != -1
True
sage: str((x*y)._operator).find("add") != -1
False
sage: str((x*y)._operator).find("mul") != -1
True
sage: str((x**y)._operator).find("mul") != -1
False
sage: str((x**y)._operator).find("pow") != -1
True
Which is quite fragile. :) Generally I think I know everything I need.
Thanks,
Ondrej
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