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dbeta

PURPOSE

DBETA The beta density function

SYNOPSIS

function d = dbeta(x,a,b)

DESCRIPTION

DBETA    The beta density function

         f = dbeta(x,a,b)

CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

qbeta QBETA The beta inverse distribution function

SOURCE CODE

0001 function d = dbeta(x,a,b)
0002 %DBETA    The beta density function
0003 %
0004 %         f = dbeta(x,a,b)
0005 
0006 %       Anders Holtsberg, 18-11-93
0007 %       Copyright (c) Anders Holtsberg
0008 
0009 if any(any((a<=0)|(b<=0)))
0010    error('Parameter a or b is nonpositive')
0011 end
0012 
0013 I = find((x<0)|(x>1));
0014 
0015 d = x.^(a-1) .* (1-x).^(b-1) ./ beta(a,b);
0016 d(I) = 0*I;