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

    NAME

    clog, clogf, clogl - natural logarithm of a complex number
 

    SYNOPSIS

    #include <complex.h>

    double complex clog(double complex z);
    float complex clogf(float complex z);
    long double complex clogl(long double complex z);

    Link with -lm.  

    DESCRIPTION

    The logarithm clog() is the inverse function of the exponential cexp(3). Thus, if y = clog(z), then z = cexp(y). The imaginary part of y is chosen in the interval [-pi,pi].

    One has: 

    
    clog(z) = log(cabs(z)) + I * carg(z)

    Note that z close to zero will cause an overflow.  

    VERSIONS

    These functions first appeared in glibc in version 2.1.  

    CONFORMING TO

    C99.  

    SEE ALSO

    cabs(3), cexp(3), clog10(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
    VERSIONS
    CONFORMING TO
    SEE ALSO
    COLOPHON

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