Fredrik Lundh wrote:
> "Sssasss" wrote:
>> > I wan't to multiply two square matrixes, and i don't understand why it
> > doesn't work.
> >
> > def multmat(A,B):
> > "A*B"
> > if len(A)!=len(B): return "error"
> > D=[]
> > C=[]
> > for i in range(len(A)): D.append(0)
> > for i in range(len(A)): C.append(D)
>> append doesn't copy data, so you're basically adding len(A) references to
> the same D list to C. for more on this, see:
>>http://pyfaq.infogami.com/how-do-i-create-a-multidimensional-list>> </F>
Ok!! Tank you very much, i understand now.
ciao
