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cargl (3)
  • cargl (3) ( Русские man: Библиотечные вызовы )
  • >> cargl (3) ( Linux man: Библиотечные вызовы )
  • cargl (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    carg, cargf, cargl - calculate the argument
     
    

    SYNOPSIS

    #include <complex.h>

    double carg(double complex z);
    float cargf(float complex z);
    long double cargl(long double complex z);

    Link with -lm.  

    DESCRIPTION

    A complex number can be described by two real coordinates. One may use rectangular coordinates and gets

        z = x + I * y
    

    where x = creal(z) and y = cimag(z).

    Or one may use polar coordinates and gets

    
        z = r * cexp(I * a)
    
    
    where r = cabs(z) is the "radius", the "modulus", the absolute value of z, and a = carg(z) is the "phase angle", the argument of z.

    One has:

    
        tan(carg(z)) = cimag(z) / creal(z)
    
     

    RETURN VALUE

    The return value is the range of [-pi,pi].  

    VERSIONS

    These functions first appeared in glibc in version 2.1.  

    CONFORMING TO

    C99.  

    SEE ALSO

    cabs(3), complex(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    VERSIONS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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