# [Tutor] doing maths on lists

Chris Begert cbeg at gmx.de
Mon Dec 20 12:28:42 CET 2010

```Thanks

I tried to put a float around my lists as well as around the sum but it didn't work.

Do I have to do some type casting around all items of the list?

Cheers

-------- Original-Nachricht --------
> Datum: Mon, 20 Dec 2010 16:33:39 +0530
> Von: Nitin Pawar <nitinpawar432 at gmail.com>
> An: Chris Begert <cbeg at gmx.de>
> CC: tutor at python.org
> Betreff: Re: [Tutor] doing maths on lists

> you may want to do type casting whenever you have a float answer cause
> integer to float causes data loss
>
> On Mon, Dec 20, 2010 at 4:28 PM, Chris Begert <cbeg at gmx.de> wrote:
>
> > Bonjour
> >
> > I have three lists with 65 float items and would like to do the
> following
> > sum:
> >
> > L0 = ([sum(L0A[i]*cos(L0B[i]+L0C[i]*JME) for i in range(0,64,1))])
> >
> > So it just should do a sum across all the items in the list:
> >
> > L0A[0]*cos(L0B[0]+L0C[0]*JME)+ L0A[1]*cos(L0B[1]+L0C[1]*JME)+...
> > + L0A[64]*cos(L0B[64]+L0C[64]*JME)= some float number
> >
> >
> > However, I always get this error:
> >
> > TypeError: can't multiply sequence by non-int of type 'float'
> >
> > I looked it up and there seems to be some solution using either the
> > "for-in" command or the "map(int,...)" command but I just can't get it
> to
> > work....
> >
> >
> > Any help will be very much appreciated :)
> >
> > Greetings from Sydney
> > Chris
> > --
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>
>
>
> --
> Nitin Pawar

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