Converting from density to cumulative distribution

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?cumsum
x = c(1,3,2,2,5)
cumsum(x)
[1]  1  4  6  8 13

On Thu, Apr 21, 2011 at 11:05 AM, Parodi, Pietro
Hello

I'm trying to do the following vector operation:

given vector x = c(x1,x2,x3,x4...xn), ?produce vector y =
c(x1,x1+x2,x1+x2+x3,...x1+...+xn).

E.g., ?from x = c(1,3,2,2,5), produce y = c(1,4,6,8,13).

The underlying problem is finding the cumulative distribution function
given the empirical density distribution function.

I have done some research on this but the only relevant thing I've found
is the function "integrate", which however gives me the sum of the whole
vector not the step-wise sum.

Thanks for your help

Pietro

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