# clogl(3) [osx man page]

CLOG(3) BSD Library Functions Manual CLOG(3)NAME

clogcomplex logarithm function--SYNOPSIS

#include <complex.h> double complex clog(double complex z); long double complex clogl(long double complex z); float complex clogf(float complex z);DESCRIPTION

clog(z) returns the complex logarithm of z. clog(conj(z)) = conj(clog(z)), for all complex floating-point numbers z.SPECIAL VALUES

The conjugate symmetry of clog() is used to abbreviate the specification of special values. clog(-0 + 0i) returns+ Pi i and raises the divide-by-zero flag. clog(0 + 0i) returns-inf+ 0i and raises the divide-by-zero flag. clog(x + inf i) returns inf + Pi/2 i, for finite x. clog(x + NaN i) returns NaN + NaN i. clog(-inf + yi) returns inf + Pi i, for finite positive y. clog(inf + yi) returns inf + 0i, for finite positive y. clog(-inf + inf i) returns inf + 3Pi/4 i. clog(inf + inf i) returns inf + Pi/4 i. clog(+-inf + NaN i) returns inf + NaN i. clog(NaN + yi) returns NaN + NaN i, for finite y. clog(NaN + inf i) returns inf + NaN i. clog(NaN + NaN i) returns NaN + NaN i.-infNOTES

SEE ALSO

cexp(3) log(3) complex(3)STANDARDS

The clog() function conforms to ISO/IEC 9899:2011.4th Berkeley DistributionDecember 11, 2006 4th Berkeley Distribution

## Check Out this Related Man Page

CEXP(3) BSD Library Functions Manual CEXP(3)NAME

cexpcomplex exponential function--SYNOPSIS

#include <complex.h> double complex cexp(double complex z); long double complex cexpl(long double complex z); float complex cexpf(float complex z);DESCRIPTION

cexp(z) returns the complex exponential of z. cexp(conj(z)) = conj(cexp(z)), for all complex floating-point numbers z.SPECIAL VALUES

The conjugate symmetry of cexp() is used to abbreviate the specification of special values. cexp(+-0 + 0i) returns 1 + 0i. cexp(x + inf i) returns NaN + NaN i, and raises the invalid flag, for finite x. cexp(x + NaN i) returns NaN + NaN i, for finite x. cexp(inf + 0i) returns inf + 0i. For the following two cases, cis(y) denotes cos(y) + I*sin(y). cexp(-inf + yi) returns 0*cis(y), for finite y. cexp(inf + yi) returns inf*cis(y), for finite nonzero y. cexp(-inf + inf i) returns+ 0i. cexp(inf + inf i) returns-0+ NaN i, and raises the invalid flag. cexp(-inf + NaN i) returns-inf+ 0i. cexp(inf + NaN i) returns-0+ NaN i. cexp(NaN + 0i) returns NaN + 0i. cexp(NaN + yi) returns NaN + NaN i for all nonzero numbers y. cexp(NaN + NaN i) returns NaN + NaN i.-infSEE ALSO

exp(3) clog(3) complex(3)STANDARDS

The cexp() function conforms to ISO/IEC 9899:2011.4th Berkeley DistributionDecember 11, 2006 4th Berkeley Distribution