I need to graph the error function (integrate 1/sqrt(2 pi) exp(-1/2 t^2) dt - Wolfram|Alpha) in my grapher. My grapher cannot graph integrals and does not have a special error function graphing option as in mathematica.

Is there a good old fashioned basic function y=f(x) out there that graphs the same as the error function? I notice that the logistic function can be fuddled with to give an approximate fit, but not exact.

Thanks