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95 lines
3.6 KiB
HTML
95 lines
3.6 KiB
HTML
4 years ago
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<title>cproj (LIBM)</title>
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<body lang="en">
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<a name="cproj"></a>
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<div class="header">
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<p>
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Next: <a href="creal.html#creal" accesskey="n" rel="next">creal</a>, Previous: <a href="cpow.html#cpow" accesskey="p" rel="prev">cpow</a>, Up: <a href="Complex.html#Complex" accesskey="u" rel="up">Complex</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="cproj_002c-cprojf_002d_002d_002d-Riemann-sphere-projection"></a>
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<h3 class="section">2.17 <code>cproj</code>, <code>cprojf</code>— Riemann sphere projection</h3>
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<a name="index-cproj"></a>
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<a name="index-cprojf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <complex.h>
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double complex cproj(double complex <var>z</var>);
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float complex cprojf(float complex <var>z</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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These functions compute a projection of <var>z</var> onto the Riemann
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sphere: <var>z</var> projects to <var>z</var> except that all complex infinities
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(even those with one infinite part and one NaN part) project
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to positive infinity on the real axis. If <var>z</var> has an infinite part,
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then <code>cproj</code>(<var>z</var>) is equivalent to
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</p>
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<p>INFINITY + I * copysign(0.0, cimag(z))
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</p>
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<p><code>cprojf</code> is identical to <code>cproj</code>, except that it performs
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its calculations on <code>floats complex</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The cproj functions return the value of the projection onto
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the Riemann sphere.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>cproj</code> and <code>cprojf</code> are ISO C99
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</p>
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<br>
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