S-plus question about length of data

ToxicBug

Hello, I'm trying to figure out how to program the Exponential Integral function, and then make it compute values for a vector of data.

I have this:

Code:

expint <- function(s){ 
     integrand <- function(x) {exp(x)/x} 
     integrate(integrand, lower = -Inf, upper = s)$integral
}

if I put expint(-1) then it works, but it doesn't work if I put expint(vectorofvalues), it gives me the following error:

Warning messages:
1: Condition has 72 elements: only the first used in: e1 && e2
2: Condition has 72 elements: only the first used in: e1 || e2
Problem in bound + (sgn * (1 - nodes))/nodes: length of longer operand (72) should be a multiple of length of shorter (15)

Anyone know what I need to change for it to work with vectors?

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