Dnia 15-08-2009 o 22:50:39 Stef Mientki <stef.mien...@gmail.com>
napisał(a):
hello,
I'm not sure if "unpacking" is the right term
but if I have a tuple of 2 arrays,
I can either call a function with:
Space_State = tf2ss ( filt[0], filt[1] )
or with
Space_State = tf2ss ( *filt )
Now if I've to call a function with more parameters,
why can't I use (Polynome is again a tuple of 2 arrays) :
(which already gives an error in the IDE)
Respons = signal.lfilter ( *Polynome, Signal )
and thus I've to use:
Respons = signal.lfilter ( Polynome[0], Polynome[1], Signal )
The content of that tuple or list (filt/Polynome here) doesn't matter.
Simply, when calling function, you can't put positional (non-keyword)
argument after *something.
>>> def nic(*args, **kwargs): pass
...
>>> nic(*[1,2,3], 4)
File "<stdin>", line 1
SyntaxError: only named arguments may follow *expression
That'd be ok:
Respons = signal.lfilter(*Polynome, sig=Signal) # if this method can
# receive argument
# 'sig' after more
# than len(Polynome)
# of arguments
--
Jan Kaliszewski (zuo) <z...@chopin.edu.pl>
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