Peter Dalgaard wrote: > sun wrote: >> I am converting some matlab code into R that use inverse of the >> complementary error function, erfcinv and did not find an equivalent in >> R, is there such a function in some contributed modules? >> >> > Basically, it is qnorm() with suitable scaling. The help page for Normal > has the construction for erfc() from pnorm() so just solve erfc(x) = y > for x. > Thanks for your quick answer and useful information! But please forgive my ignorance, I do not really know how to solve this inverse function actually. for example,
>erfc <- function(x) 2 * pnorm(x * sqrt(2), lower = FALSE) > erfc(0.3) [1] 0.6713732 How do I find 0.3 given 0.6713732? Thanks! ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
