Computes \(\mathrm{erf}(x) = \frac{2}{\sqrt{\pi}} \int_0^x e^{-t^2} dt\).
erf(x)
# S4 method for class 'numeric'
erf(x)
# S4 method for class 'dualr'
erf(x)The error function value. For dual input, returns a dual with derivative \((2/\sqrt{\pi}) e^{-x^2}\).
erf(1) # numeric
#> [1] 0.8427008
x <- dual_variable(1)
value(erf(x)) # erf(1)
#> [1] 0.8427008