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HP-UX Reference > Cclog(3M)HP Integrity Server OnlyHP-UX 11i Version 3: February 2007 |
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NAMEclog(), clogf(), clogl(), clogw(), clogq() — complex natural (base-e) logarithm functions SYNOPSIS#include <complex.h> double complex clog(double complex z); float complex clogf(float complex z); long double complex clogl(long double complex z); extended complex clogw(extended complex z); quad complex clogq(quad complex z); DESCRIPTIONThese functions are available only for Integrity servers. clog() returns the complex natural logarithm of z in the range of a strip mathematically unbounded along the real axis and in the interval [-iPi,+iPi] along the imaginary axis. There is a branch cut along the negative real axis. clogf() is a float complex version of clog(); it takes a float complex argument and returns a float complex result. clogl() is a long double complex version of clog(); it takes a long double complex argument and returns a long double complex result. clogw() is an extended complex version of clog(); it takes an extended complex argument and returns an extended complex result. clogq() is equivalent to clogl() on HP-UX systems. USAGETo use these functions, compile with the default -Ae option. To use clogw() or clogq(), compile with the -fpwidetypes option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line. RETURN VALUEclog(conj(z)) = conj(clog(z)). clog(-0+i0) returns -Inf+iPi and raises the divide-by-zero floating-point exception. clog(+0+i0) returns -Inf+i0 and raises the divide-by-zero floating-point exception. clog(x+iInf) returns +Inf+iPi/2, for finite x. clog(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite x. clog(-Inf+iy) returns +Inf+iPi, for finite positive-signed y. clog(+Inf+iy) returns +Inf+i0, for finite positive-signed y. clog(-Inf+iInf) returns +Inf+i3Pi/4. clog(+Inf+iInf) returns +Inf+ipi/4. clog(±Inf+iNaN) returns +Inf+iNaN. clog(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y. clog(NaN+iInf) returns +Inf+iNaN. clog(NaN+iNaN) returns NaN+iNaN. |
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