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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