On 2/9/11 9:18 PM, Robert Bradshaw wrote:
On Wed, Feb 9, 2011 at 6:43 PM, Dox<o.castillo.felis...@gmail.com> wrote:
Hi people!
I was wondering if there is a way of bundle two kind of different
objects together and define operations on them.
Suppose, I'd like to bundle a number and a string (3, Hello) and (4,
World!!)... then define and operation which multiplies the numbers and
add strings, so the result is (12, HelloWorld!!)
Something like that!
Yes. See, for example, how the sage.misc.preparser.BackslashOperator
is implemented. (I think we have a more generic one, but I'm not sure
where it is.)
I presume you mean the infix decorator from this patch:
http://trac.sagemath.org/sage_trac/ticket/6245
I was going to point out the page in the reference manual, but
apparently somehow that file is not documented in the reference manual.
Anyways, do infix_operator?, see sage.misc.decorator, or just look at
this example:
sage: @infix_operator('add')
....: def my_add(a,b):
....: return (a[0]*b[0], a[1]+b[1])
....:
sage: (3,"Hello") +my_add+ (4, "World!!")
(12, 'HelloWorld!!')
But it might make a lot more sense to make a simple class that prints
out the string and number and has an operation defined on it.
sage: class MyClass:
....: def __init__(self, num, s):
....: self._num=num
....: self._s=s
....: def __add__(self, other):
....: if isinstance(other, MyClass):
....: return MyClass(self._num*other._num, self._s+other._s)
....: raise NotImplemented
....: def __repr__(self):
....: return str((self._num, self._s))
....: def __str__(self):
....: return self.__repr__()
....:
sage: a=MyClass(3,"Hello")
sage: b=MyClass(4,"World!!")
sage: a
(3, 'Hello')
sage: b
(4, 'World!!')
sage: a+b
(12, 'HelloWorld!!')
Thanks,
Jason
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