[R] R equivalent of erfcinv in matlab
flyhyena at yahoo.com.cn
Mon Apr 14 00:50:28 CEST 2008
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.
>erfc <- function(x) 2 * pnorm(x * sqrt(2), lower = FALSE)
How do I find 0.3 given 0.6713732?
More information about the R-help