clogf, clog, clogl

 

C

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Numerics

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Complex number arithmetic

Types and the imaginary constant
complex Complex_I CMPLX	imaginary Imaginary_I I
Manipulation
cimag creal carg	conj cproj
Power and exponential functions
cexp clog	cpow csqrt
Trigonometric functions
ccos csin ctan	cacos casin catan
Hyperbolic functions
ccosh csinh ctanh	cacosh casinh catanh

 

Defined in header <complex.h>
float complex       clogf( float complex z );		(since C99)
double complex      clog( double complex z );		(since C99)
long double complex clogl( long double complex z );		(since C99)

Computes the complex natural (base-e) logarithm of z with branch cut along the negative real axis.

Parameters

z

-

complex argument

Return value

The complex natural logarithm of z in the interval (−∞; +∞) along the real axis and in the interval (−iπ; +iπ) along the imaginary axis.

Example

Run this code

#include <stdio.h>
#include <complex.h>
 
int main(void)
{
    double complex z = clog(1.0 + 2.0*I);
    printf("%f%+fi\n", creal(z), cimag(z));
 
    return 0;
}

Output:

0.804719+1.107149i

See also

cexpcexpfcexpl (C99)(C99)(C99)	computes the complex base-e exponential (function)
loglogflogl (C99)(C99)	computes natural (base-e) logarithm (ln(x)) (function)
C++ documentation for log