[R] R equivalent of erfcinv in matlab

[Peter Dalgaard]

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.

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