f(x) = .01*(1.2^y) integrated from 0 to x Find x such that f(x) = some number, say 4 How do we do it in R?
aar paar <aar420 <at> hotmail.com> writes: : : f(x) = .01*(1.2^y) integrated from 0 to x : : Find x such that : : f(x) = some number, say 4 : : How do we do it in R? You don't need R for this. Your integral can be solved analytically, check any table of integrals, and the rest can be solved using elementary algebra so R is not needed here. If you really do want to use R anyways: g <- function(y) .01 * 1.2^y f <- function(x) integrate(g, 0, x)$value - 4 uniroot(f, low = -100, up = 100)