OK, thanks for this. It works!
Where would I have found this distinction in the documentation?
Thanks
Robin
On Mon, Jan 21, 2013 at 10:37 PM, P Purkayastha <ppu...@gmail.com> wrote:
> On 01/21/2013 05:01 PM, robin hankin wrote:
>>
>> Hello. kubuntu linux, sage 5.5
>>
>> I want to define a function that takes argument 'x' and returns 'x^2'.
>> But I cannot make this idea work when 'x' is an element of a
>> permutation group. As per the snippet below, 'u^2' is perfectly well
>> defined, but f(u) returns an error.
>>
>> How do I define a function f() such that f(x) returns x^2 even when x
>> is a peculiar object such as an element of a permutation group?
>>
>>
>>
>> sage: f(x) = x^2
>
>
> This defines a symbolic expression.
>
> sage: preparse('f(x) = x^2')
> '__tmp__=var("x"); f = symbolic_expression(x**Integer(2)).function(x)'
>
>
>> sage: f(3)
>> 9
>> sage: u = CubeGroup().U()
>> sage: u^2
>> (1,8)(2,7)(3,6)(4,5)(9,25)(10,26)(11,27)(17,33)(18,34)(19,35)
>> sage: f(u)
>>
>> ---------------------------------------------------------------------------
>> TypeError
>
>
> Use a python function instead:
>
> sage: def f(u): return u^2
> ....:
> sage: f(u)
> (1,8)(2,7)(3,6)(4,5)(9,25)(10,26)(11,27)(17,33)(18,34)(19,35)
>
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--
Robin Hankin
Uncertainty Analyst
hankin.ro...@gmail.com
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