i wonder if there is an automatic way to make that without calling a function.
You mean without _explicitely_ calling a function. May I inquire why you need to write f instead of f(x)?
an automatic way that depends on changing the value of x. as each time x=something used the whole matrix changes automaticly.
As pointed out by El Pitonero property can be your friend:
>>> class A(object): ... def get_v(self): ... return [1,x] ... v=property(get_v) ... >>> a=A() >>> x=0 >>> a.v [1, 0] >>> x=2 >>> a.v [1, 2] >>>
However, you will calculate your matrix each time you will access it (and I find it ugly to use a global variable this way).
You can however build it the other way round:
>>> class B(object): ... def __init__(self): ... self.v=[1,0] ... self.x=0 ... def calc_v(self): ... self.v[1]=self.__x ... def set_x(self,x): ... self.__x=x ... self.calc_v() ... def get_x(self): ... return self.__x ... x=property(get_x, set_x) ... >>> b=B() >>> b.v [1, 0] >>> b.x=2 >>> b.v [1, 2] >>>
This time, calculations only occur when you change the value of x. -- http://mail.python.org/mailman/listinfo/python-list
