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<title>Description of lpdfgam</title>
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<h1>lpdfgam
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<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>log GAMMA PDF</strong></div>
<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function ldens = lpdfgam(x,a,b); </strong></div>
<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> log GAMMA PDF</pre></div>
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<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
This function calls:
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This function is called by:
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<li><a href="compDist.html" class="code" title="function compdist(xparam1, x2, pltopt, figurename)">compDist</a> </li><li><a href="draw_prior_density.html" class="code" title="function [x,f,abscissa,dens,binf,bsup] = draw_prior_density(indx);">draw_prior_density</a> stephane.adjemian@ens.fr [07-15-2004]</li><li><a href="mj_qgamma.html" class="code" title="function x = mj_qgamma(p,a)">mj_qgamma</a> MJ_QGAMMA The gamma inverse distribution function</li><li><a href="priordens.html" class="code" title="function lnprior = priordens(para, pshape, p1, p2, p3, p4)">priordens</a> This procedure computes a prior density for</li></ul>
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<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function ldens = lpdfgam(x,a,b);</a>
0002 <span class="comment">% log GAMMA PDF</span>
0003 ldens = -gammaln(a) -a*log(b)+ (a-1)*log(x) -x/b ;
0004
0005 <span class="comment">% 10/11/03 MJ adapted from an earlier GAUSS version by F. Schorfeide,</span>
0006 <span class="comment">% translated to MATLAB by R. Wouters</span>
0007 <span class="comment">% use MATLAB gammaln rather than lngam</span></pre></div>
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