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lpdfgam

PURPOSE

log GAMMA PDF

SYNOPSIS

function ldens = lpdfgam(x,a,b);

DESCRIPTION

 log GAMMA PDF

CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

compDist
draw_prior_density stephane.adjemian@ens.fr [07-15-2004]
mj_qgamma MJ_QGAMMA The gamma inverse distribution function
priordens This procedure computes a prior density for

SOURCE CODE

0001 function  ldens = lpdfgam(x,a,b);
0002 % log GAMMA PDF
0003   ldens = -gammaln(a) -a*log(b)+ (a-1)*log(x) -x/b ;
0004 
0005 % 10/11/03  MJ adapted from an earlier GAUSS version by F. Schorfeide,
0006 %              translated to MATLAB by R. Wouters
0007 %              use MATLAB gammaln rather than lngam