cumulative sum in SAGE

[Funmilayo Eniola Kazeem]

Hello,

Is there a command for cumulative sum in SAGE? If yes, what is it? If not, how do I do it?

Thanks,

[John Cremona]

What do you mean by cumulative sum? There is sum (from python), e.g.

sage: sum(range(100))
4950
sage: sum([i^3 for i in range(100)])
24502500

John Cremona

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[Jori Mantysalo]

On Wed, 16 Apr 2014, Funmilayo Eniola Kazeem wrote:

> Is there a command for cumulative sum in SAGE? If yes, what is it? If not,
> how do I do it?

somenumbers=[1, 1.4142, 1.7321, 2]
[sum(somenumbers[0:i]) for i in range(1, len(somenumbers)+1)]

Of course not optimal, but easy if speed is not an issue. I don't know if
this if fast with %cython or not.

--
Jori Mäntysalo

[William Stein]

stats.TimeSeries has a very fast sums method - everything must be float though.  Numpy also has something.

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