xref: /386bsd/usr/share/man/cat3/erf.0 (revision a2142627) 
1ERF(3)                    386BSD Programmer's Manual                    ERF(3)
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3NNAAMMEE
4     eerrff, eerrffcc - error function operators
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6SSYYNNOOPPSSIISS
7     ##iinncclluuddee <<mmaatthh..hh>>
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9     _d_o_u_b_l_e
10     eerrff(_d_o_u_b_l_e _x)
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12     _d_o_u_b_l_e
13     eerrffcc(_d_o_u_b_l_e _x)
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15DDEESSCCRRIIPPTTIIOONN
16     These functions calculate the error function of _x.
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18     The eerrff() calculates the error function of x; where
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20           erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.
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22     The eerrffcc() function calculates the complementary error function of _x;
23     that is eerrffcc() subtracts the result of the error function eerrff(_x) from
24     1.0.  This is useful, since for large _x places disappear.
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26SSEEEE AALLSSOO
27     math(3)
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29HHIISSTTOORRYY
30     The eerrff() and eerrffcc() functions appeared in 4.3BSD.
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324.3 Berkeley Distribution       April 20, 1991                               1
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