clog, clogf, clogl
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Retrieves the natural logarithm of a complex number, with a branch cut along the negative real axis.
_Dcomplex clog( _Dcomplex z ); _Fcomplex clog( _Fcomplex z ); // C++ only _Lcomplex clog( _Lcomplex z ); // C++ only _Fcomplex clogf( _Fcomplex z ); _Lcomplex clogl( _Lcomplex z );
Parameters
z
The base of the logarithm.
The natural logarithm of z. The result is unbounded along the real axis and in the interval [−iπ, +iπ] along the imaginary axis.
The possible return values are:
| z parameter | Return value |
|---|---|
| Positive | The base 10 logarithm of z |
| Zero | - ∞ |
| Negative | NaN |
| NaN | NaN |
| + ∞ | + ∞ |
Because C++ allows overloading, you can call overloads of clog that take and return _Fcomplex and _Lcomplex values. In a C program, clog always takes and returns a _Dcomplex value.
| Routine | C header | C++ header |
|---|---|---|
clog, clogf, clogl | <complex.h> | <ccomplex> |
For more compatibility information, see Compatibility in the Introduction.
Alphabetical Function Reference
cexp, cexpf, cexpl
cpow, cpowf, cpowl
clog10, clog10f, clog10l