[R] R equivalent of erfcinv in matlab

[sun]

Bill.Venables at csiro.au wrote:
> At a guess ...
> 
>> erfc <- function(x) 2 * pnorm(x * sqrt(2), lower = FALSE)
>> erfcinv <- function(x) qnorm(x/2, lower = FALSE)/sqrt(2)
>> erfc(0.3)
> [1] 0.6713732
>> erfcinv(erfc(0.3))
> [1] 0.3
> 
> It may not hurt to include these wrappers in R for matlab refugees.
> They seem to be coming thick and fast these days.
> 
> 
> Bill Venables
> CSIRO Laboratories
> PO Box 120, Cleveland, 4163
> AUSTRALIA
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> http://www.cmis.csiro.au/bill.venables/ 

Thanks very much indeed. This solved my problem.  I think it will be 
very helpful to have these wrapper functions at least in some extra 
packages for the ease of people migrating.