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<h1 id="shcrosspowerdensityl">SHCrossPowerDensityL</h1>
<p>Compute the cross-power spectral density of two real functions for a single spherical harmonic degree.</p>
<h1 id="usage">Usage</h1>
<p><code>cpsd</code> = SHCrossPowerDensityL (<code>cilm1</code>, <code>cilm2</code>, <code>l</code>)</p>
<h1 id="parameters">Parameters</h1>
<dl>
<dt><code>cpsd</code> : output, real*8</dt>
<dd>Cross-power spectral density of the two real functions for spherical harmonic degree <code>l</code>.
</dd>
<dt><code>cilm1</code> : input, real*8, dimension (2, <code>lmaxin1</code>+1, <code>lmaxin1</code>+1)</dt>
<dd>The spherical harmonic coefficients of the first real function.
</dd>
<dt><code>cilm2</code> : input, real*8, dimension (2, <code>lmaxin2</code>+1, <code>lmaxin2</code>+1)</dt>
<dd>The spherical harmonic coefficients of the second real function.
</dd>
<dt><code>l</code> : input, integer</dt>
<dd>The spherical harmonic degree. This must be less than or equal to the minimum of <code>lmaxin1</code> and <code>lmaxin2</code>.
</dd>
</dl>
<h1 id="description">Description</h1>
<p><code>SHCrossPowerDensityL</code> will calculate the cross-power spectral density of two real functions expressed in real 4-pi normalized spherical harmonics for a single spherical harmonic degree <code>l</code>. This is explicitly calculated as:</p>
<p><code>cpsd = Sum_{i=1}^2 Sum_{m=0}^l cilm1(i, l+1, m+1) * cilm2(i, l+1, m+1) / (2l + 1)</code>.</p>
<h1 id="see-also">See also</h1>
<p><a href="shpowerl.html">shpowerl</a>, <a href="shpowerdensityl.html">shpowerdensityl</a>, <a href="shcrosspowerl.html">shcrosspowerl</a>, <a href="shpowerspectrum.html">shpowerspectrum</a>, <a href="shpowerspectrumdensity.html">shpowerspectrumdensity</a>, <a href="shcrosspowerspectrum.html">shcrosspowerspectrum</a>, <a href="shcrosspowerspectrumdensity.html">shcrosspowerspectrumdensity</a>, <a href="shadmitcorr.html">shadmitcorr</a></p>
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