Odd Series?

[Chris Maness]

Is there a way to only add the odd integers of a sum in Sage?

Chris 

[kcrisman]

Is there a way to only add the odd integers of a sum in Sage?

Do you mean something like this?

sage: L = [1,2,3,4,5,6,7,8,9,10]

sage: L[1::2]

[2, 4, 6, 8, 10]

sage: L[0::2]

[1, 3, 5, 7, 9]

sage: sum(L[1::2])

30

I didn't know about this cool feature of slice notation until looking it up - see http://stackoverflow.com/questions/12433695/extract-elements-of-list-at-odd-positions

- kcrisman

[John Cremona]

On 26 June 2014 04:21, kcrisman <kcri...@gmail.com> wrote:
>
>
>> Is there a way to only add the odd integers of a sum in Sage?
>
>
> Do you mean something like this?
>
> sage: L = [1,2,3,4,5,6,7,8,9,10]
> sage: L[1::2]
> [2, 4, 6, 8, 10]
> sage: L[0::2]
> [1, 3, 5, 7, 9]
> sage: sum(L[1::2])
> 30

Or perhaps this?

sage: L = [1,2,3,4,5,6,7,8,9,10]
sage: sum(L)
55
sage: sum([x for x in L if x%2==1])
25

>
> I didn't know about this cool feature of slice notation until looking it up
> - see
> http://stackoverflow.com/questions/12433695/extract-elements-of-list-at-odd-positions
>
> - kcrisman
>

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