[R] Cumulative sum of vector

From: Keith Jones <keithlj_at_suddenlink.net>
Date: Sat, 5 Jan 2008 08:32:41 -0600


Hi,

Maybe I have not been looking in the right spot, but, I have not been able to fine a command to automatically calculate the running cumulative sum of a vector. Is there such a command?

Example of current code:
> eig$values

[1] 678.365651 6.769697 2.853783
> prop<-eig$values/sum(eig$values)
> prop

[1] 0.986012163 0.009839832 0.004148005
> cum<-c(prop[1],sum(prop[1:2]),sum(prop[1:3]))
> cum

[1] 0.9860122 0.9958520 1.0000000

This works, but, if the length of the vector changes I have to manually change the code.

Thanks,

Keith Jones



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