clog10(3) [x11r4 man page]

CLOG10(3)						     Linux Programmer's Manual							 CLOG10(3)

NAME

       clog10, clog10f, clog10l - base-10 logarithm of a complex number

SYNOPSIS

       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #include <complex.h>

       double complex clog10(double complex z);
       float complex clog10f(float complex z);
       long double complex clog10l(long double complex z);

       Link with -lm.

DESCRIPTION

       The call clog10(z) is equivalent to:

	   clog(z)/log(10)

       or equally:

	   log10(cabs(c)) + I * carg(c) / log(10)

       The other functions perform the same task for float and long double.

       Note that z close to zero will cause an overflow.

VERSIONS

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-------------------------------+---------------+---------+
       |Interface		       | Attribute     | Value	 |
       +-------------------------------+---------------+---------+
       |clog10(), clog10f(), clog10l() | Thread safety | MT-Safe |
       +-------------------------------+---------------+---------+
CONFORMING TO

       These functions are GNU extensions.  The identifiers are reserved for future use in C99 and C11.

SEE ALSO

       cabs(3), cexp(3), clog(3), clog2(3), complex(7)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2017-09-15								 CLOG10(3)

CATANH(3)						     Linux Programmer's Manual							 CATANH(3)

NAME

       catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS

       #include <complex.h>

       double complex catanh(double complex z);
       float complex catanhf(float complex z);
       long double complex catanhl(long double complex z);

       Link with -lm.

DESCRIPTION

       These functions calculate the complex arc hyperbolic tangent of z.  If y = catanh(z), then z = ctanh(y).  The imaginary part of y is chosen
       in the interval [-pi/2,pi/2].

       One has:

	   catanh(z) = 0.5 * (clog(1 + z) - clog(1 - z))

VERSIONS

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-------------------------------+---------------+---------+
       |Interface		       | Attribute     | Value	 |
       +-------------------------------+---------------+---------+
       |catanh(), catanhf(), catanhl() | Thread safety | MT-Safe |
       +-------------------------------+---------------+---------+
CONFORMING TO

       C99, POSIX.1-2001, POSIX.1-2008.

EXAMPLE

       /* Link with "-lm" */

       #include <complex.h>
       #include <stdlib.h>
       #include <unistd.h>
       #include <stdio.h>

       int
       main(int argc, char *argv[])
       {
	   double complex z, c, f;

	   if (argc != 3) {
	       fprintf(stderr, "Usage: %s <real> <imag>
", argv[0]);
	       exit(EXIT_FAILURE);
	   }

	   z = atof(argv[1]) + atof(argv[2]) * I;

	   c = catanh(z);
	   printf("catanh() = %6.3f %6.3f*i
", creal(c), cimag(c));

	   f = 0.5 * (clog(1 + z) - clog(1 - z));
	   printf("formula  = %6.3f %6.3f*i
", creal(f2), cimag(f2));

	   exit(EXIT_SUCCESS);
       }

SEE ALSO

       atanh(3), cabs(3), cimag(3), ctanh(3), complex(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2015-04-19								 CATANH(3)