This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


gives the imaginary error function erf(i​z)/i.
  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • For certain special arguments, Erfi automatically evaluates to exact values.
  • Erfi can be evaluated to arbitrary numerical precision.
  • Erfi automatically threads over lists.
New in 3