complex man page on SunOS

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complex.h(3HEAD)		    Headers		      complex.h(3HEAD)

NAME
       complex.h, complex - complex arithmetic

SYNOPSIS
       #include <complex.h>

DESCRIPTION
       The <complex.h> header defines the following macros:

       complex	       Expands to _Complex.

       _Complex_I      Expands	to  a  constant expression of type const float
		       _Complex, with the value of the	imaginary  unit	 (that
		       is, a number i such that i2−1).

       imaginary       Expands to _Imaginary.

       _Imaginary_I    Expands	to  a  constant expression of type const float
		       _Imaginary with the value of the imaginary unit.

       I	       Expands to either _Imaginary_I or _Complex_I. If _Imag‐
		       inary_I is  not defined, I expands to _Complex_I.

       An application can undefine and then, if appropriate, redefine the com‐
       plex, imaginary, and I macros.

USAGE
       Values are interpreted as radians, not degrees.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       cabs(3M),  cacos(3M),  cacosh(3M),  carg(3M),  casin(3M),   casinh(3M),
       catan(3M),   catanh(3M),	  ccos(3M),  ccosh(3M),	 cexp(3M),  cimag(3M),
       clog(3M),   conj(3M),   cpow(3M),   cproj(3M),	creal(3M),   csin(3M),
       csinh(3M), csqrt(3M), ctan(3M), ctanh(3M), attributes(5), standards(5)

NOTES
       The  choice  of	I  instead of i for the imaginary unit concedes to the
       widespread use of the identifier i for other purposes. The  application
       can  use	 a different identifier, say j, for the imaginary unit by fol‐
       lowing the inclusion of the <complex.h> header with:

       #undef I
       #define j _Imaginary_I

       An I suffix to designate imaginary constants is not required, as multi‐
       plication  by  I	 provides a sufficiently convenient and more generally
       useful notation for imaginary terms. The corresponding  real  type  for
       the  imaginary unit is float, so that use of I for algorithmic or nota‐
       tional convenience does not result in widening types.

       On systems with imaginary types, the application	 has  the  ability  to
       control	whether	 use  of  the macro I introduces an imaginary type, by
       explicitly defining I to be _Imaginary_I or _Complex_I.

       Disallowing imaginary types is useful for some applications intended to
       run on implementations without support for such types.

       The  macro _Imaginary_I provides a test for whether imaginary types are
       supported. The cis() function (cos(x) + I*sin(x))  was  considered  but
       rejected	 because  its implementation is easy and straightforward, even
       though some implementations could compute sine and  cosine  more	 effi‐
       ciently in tandem.

SunOS 5.10			  17 Dec 2003		      complex.h(3HEAD)
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