[R] Using integrate() with vectors as boundaries rather than scalars

From: Tobias <tobias_elbert_at_hotmail.com>
Date: Wed 11 Oct 2006 - 03:59:54 GMT

Hi all

my apologies if above title is misleading, but here is my problem anyways:

I need to evaluate an integral n times. Since I can't get my head around vectorization as of yet, I have coded it up in a loop, i.e.:

for (i in 1:n)

{     

    z[i] <- integrate(dnorm,x[i],Inf)

}

Since n is quite large in my operation, ~40000, I would rather stack all the elements of x into a vector and then evaluate the integral for each vector element in x up to infinity. So that the operation would look something like this:

z <- integrate(dnorm,x,Inf)

I am not sure if this works, as I am new to R, however managed the equivalent in MatLab. Is this possible at all? If yes, your input would be highly appreciated.

Regards

Tobias

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