Manual Pages for UNIX Operating System command usage for man complex

Headers                                          complex.h(3HEAD)



NAME
     complex.h, complex - complex arithmetic

SYNOPSIS
     #include 


DESCRIPTION
     The  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 i^2=-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 _Imaginary_I is  not defined,
                     I expands to _Complex_I.



     An application can undefine and then, if appropriate,  rede-
     fine the complex, imaginary, and I macros.

USAGE
     Values are interpreted as radians, not degrees.

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













SunOS 5.11          Last change: 17 Dec 2003                    1






Headers                                          complex.h(3HEAD)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | Standard                    | See standards(5).           |
    |_____________________________|_____________________________|


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 pur-
     poses. The application can use a different  identifier,  say
     j,  for the imaginary unit by following the inclusion of the
      header with:

       #undef I
       #define j _Imaginary_I



     An  I  suffix  to  designate  imaginary  constants  is   not
     required,  as  multiplication  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  notational  con-
     venience 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 efficiently in tandem.



SunOS 5.11          Last change: 17 Dec 2003                    2