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clogf, clog, clogl

From cppreference.com
< c‎ | numeric‎ | complex
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.

Contents

[edit] Parameters

z - complex argument

[edit] 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.

[edit] Example

#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

[edit] See also

(C99)(C99)(C99)
computes the complex base-e exponential
(function) [edit]
(C99)(C99)
computes natural (base-e) logarithm (ln(x))
(function) [edit]