4.4BSD/usr/share/man/cat3/erf.0

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ERF(3)                      BSD Programmer's Manual                     ERF(3)

NNAAMMEE
     eerrff, eerrffcc - error function operators

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<mmaatthh..hh>>

     _d_o_u_b_l_e
     eerrff(_d_o_u_b_l_e _x);

     _d_o_u_b_l_e
     eerrffcc(_d_o_u_b_l_e _x);

DDEESSCCRRIIPPTTIIOONN
     These functions calculate the error function of _x.

     The eerrff() calculates the error function of x; where

           erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

     The eerrffcc() function calculates the complementary error function of _x;
     that is eerrffcc() subtracts the result of the error function eerrff(_x) from
     1.0.  This is useful, since for large _x places disappear.

SSEEEE AALLSSOO
     math(3)

HHIISSTTOORRYY
     The eerrff() and eerrffcc() functions appeared in 4.3BSD.

4.3 Berkeley Distribution        June 4, 1993                                1