> Date: Fri, 27 Aug 2010 14:27:34 -0400
> From: da...@ieee.org
> To: rwob...@hotmail.com
> CC: alan.ga...@btinternet.com; tutor@python.org
> Subject: Re: [Tutor] exercise problem
>
> (Don't top-post, it loses all the context)
>
> Roelof Wobben wrote:
> > Hello,
> >
> >
> >
> > Now I have this :
> >
> >
> >
> > def add_vectors(u, v):
> > """
> > >>> add_vectors([1, 0], [1, 1])
> > [2, 1]
> > >>> add_vectors([1, 2], [1, 4])
> > [2, 6]
> > >>> add_vectors([1, 2, 1], [1, 4, 3])
> > [2, 6, 4]
> > >>> add_vectors([11, 0, -4, 5], [2, -4, 17, 0])
> > [13, -4, 13, 5]
> > """
> > teller=0
> > getal1=0
> > getal2=0
> > while teller < len(u):
> > getal1 = u[teller] + v[teller]
> > teller=teller+1
> > return uitkomst2
> >
> > uitkomst= []
> > uitkomst2=[]
> > vector= [1, 2, 1], [1, 4, 3]
> > v=vector[0]
> > u=vector[1]
> > uitkomst = add_vectors(u,v)
> > print uitkomst
> >
> >
> > The only problem I have is to build up uitkomst2.
> > on every loop getal1 has the value of the outcome.
> > So I thought this would work
> >
> > uitkomst2 [teller] = getal1
> >
> > But then i get a out of range.
> >
> >
> Where did you put that statement? Was it indented like getal1= and
> teller= ? I doubt it. If you don't use the value till the loop is
> over, then the subscript will be wrong, and so will the value.
>
> The other problem is you're confusing the variables inside the function
> with the ones declared outside. While you're learning, you should use
> different names for the two sets of variables. So create a new variable
> inside the function, called something like result. Give it an initial
> value, a list of the desired size. Then assign to one of its elements
> each time through the loop. And don't forget to change the return
> statement to return that variable instead of the confused-named one.
>
> DaveA
>
Hello,
I put in right after getal1 =
I have tried another solution nl.
Put every outcome in a string.
Then convert the string into a list like this :
def add_vectors(u, v):
"""
>>> add_vectors([1, 0], [1, 1])
[2, 1]
>>> add_vectors([1, 2], [1, 4])
[2, 6]
>>> add_vectors([1, 2, 1], [1, 4, 3])
[2, 6, 4]
>>> add_vectors([11, 0, -4, 5], [2, -4, 17, 0])
[13, -4, 13, 5]
"""
teller=0
getal1=0
uitkomst=""
while teller < len(u):
getal1 = u[teller] + v[teller]
uitkomst = uitkomst + str(getal1)
teller=teller+1
uitkomst2 = list(uitkomst)
return uitkomst2
uitkomst= []
uitkomst2=[]
vector= [1, 2, 1], [1, 4, 3]
v=vector[0]
u=vector[1]
uitkomst = add_vectors(u,v)
print uitkomst
But then I get a list of string instead of integers.
You say I have to make a vector and put all the values into it.
That can work only you have to know how big the vector must be.
Or work with a lot of if then.
Roelof
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