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  11 .TH erfc 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  12 .SH NAME
  13 erfc, erfcf, erfcl \- complementary error function
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  18 #include <math.h>
  19 
  20 \fBdouble\fR \fBerfc\fR(\fBdouble\fR \fIx\fR);
  21 .fi
  22 
  23 .LP
  24 .nf
  25 \fBfloat\fR \fBerfcf\fR(\fBfloat\fR \fIx\fR);
  26 .fi
  27 
  28 .LP
  29 .nf
  30 \fBlong double\fR \fBerfcl\fR(\fBlong double\fR \fIx\fR);
  31 .fi
  32 
  33 .SH DESCRIPTION
  34 .sp
  35 .LP
  36 These function compute the complementary error function 1.0 \(mi
  37 \fBerf(\fR\fIx\fR\fB).\fR
  38 .SH RETURN VALUES
  39 .sp
  40 .LP
  41 Upon successful completion, these functions return the value of the
  42 complementary error function.
  43 .sp
  44 .LP
  45 If \fIx\fR is NaN, a NaN is returned.
  46 .sp
  47 .LP
  48 If \fIx\fR is \(+-0, +1 is returned.
  49 .sp
  50 .LP
  51 If \fIx\fR is \(miInf, +2 is returned.
  52 .sp
  53 .LP
  54 If \fIx\fR is +Inf, 0 is returned.
  55 .SH ERRORS
  56 .sp
  57 .LP
  58 No errors are defined.
  59 .SH USAGE
  60 .sp
  61 .LP
  62 The \fBerfc()\fR function is provided because of the extreme loss of relative
  63 accuracy if \fBerf(\fR\fIx\fR\fB)\fR is called for large \fIx\fR and the result
  64 subtracted from 1.0.
  65 .SH ATTRIBUTES
  66 .sp
  67 .LP
  68 See \fBattributes\fR(5) for descriptions of the following attributes:
  69 .sp
  70 
  71 .sp
  72 .TS
  73 tab() box;
  74 cw(2.75i) |cw(2.75i) 
  75 lw(2.75i) |lw(2.75i) 
  76 .
  77 ATTRIBUTE TYPEATTRIBUTE VALUE
  78 _
  79 Interface StabilityStandard
  80 _
  81 MT-LevelMT-Safe
  82 .TE
  83 
  84 .SH SEE ALSO
  85 .sp
  86 .LP
  87 \fBerf\fR(3M), \fBisnan\fR(3M), \fBmath.h\fR(3HEAD), \fBattributes\fR(5),
  88 \fBstandards\fR(5)