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  11 .TH cproj 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  12 .SH NAME
  13 cproj, cprojf, cprojl \- complex projection functions
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  18 #include <complex.h>
  19 
  20 \fBdouble complex\fR \fBcproj\fR(\fBdouble complex\fR \fIz\fR);
  21 .fi
  22 
  23 .LP
  24 .nf
  25 \fBfloat complex\fR \fBcprojf\fR(\fBfloat complex\fR \fIz\fR);
  26 .fi
  27 
  28 .LP
  29 .nf
  30 \fBlong double complex\fR \fBcprojl\fR(\fBlong double complex\fR \fIz\fR);
  31 .fi
  32 
  33 .SH DESCRIPTION
  34 .sp
  35 .LP
  36 These functions compute a projection of \fIz\fR onto the Riemann sphere:
  37 \fIz\fR projects to \fIz\fR, except that all complex infinities (even those
  38 with one infinite part and one NaN part) project to positive infinity on the
  39 real axis. If \fIz\fR has an infinite part, then \fBcproj\fR(\fIz\fR) is
  40 equivalent to:
  41 .sp
  42 .in +2
  43 .nf
  44 INFINITY + I * copysign(0.0, cimag(z))
  45 .fi
  46 .in -2
  47 
  48 .SH RETURN VALUES
  49 .sp
  50 .LP
  51 These functions return the value of the projection onto the Riemann sphere.
  52 .SH ERRORS
  53 .sp
  54 .LP
  55 No errors are defined.
  56 .SH ATTRIBUTES
  57 .sp
  58 .LP
  59 See \fBattributes\fR(5) for descriptions of the following attributes:
  60 .sp
  61 
  62 .sp
  63 .TS
  64 tab() box;
  65 cw(2.75i) |cw(2.75i) 
  66 lw(2.75i) |lw(2.75i) 
  67 .
  68 ATTRIBUTE TYPEATTRIBUTE VALUE
  69 _
  70 Interface StabilityStandard
  71 _
  72 MT-LevelMT-Safe
  73 .TE
  74 
  75 .SH SEE ALSO
  76 .sp
  77 .LP
  78 \fBcarg\fR(3M), \fBcimag\fR(3M), \fBcomplex.h\fR(3HEAD), \fBconj\fR(3M),
  79 \fBcreal\fR(3M), \fBattributes\fR(5), \fBstandards\fR(5)