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| <h3 class="section">2.13 <code>clog</code>, <code>clogf</code>—complex base-e logarithm</h3> |
| |
| <p><a name="index-clog-178"></a><a name="index-clogf-179"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <complex.h> |
| double complex clog(double complex <var>z</var>); |
| float complex clogf(float complex <var>z</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| These functions compute the complex natural (base-<var>e</var>) logarithm |
| of <var>z</var>, with a branch cut along the negative real axis. |
| |
| <p><code>clogf</code> is identical to <code>clog</code>, except that it performs |
| its calculations on <code>floats complex</code>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The clog functions return the complex natural logarithm value, in |
| the range of a strip mathematically unbounded along the real axis |
| and in the interval [-i*pi , +i*pi] along the imaginary axis. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>clog</code> and <code>clogf</code> are ISO C99 |
| |
| <p><br> |
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