Code covered by the BSD License  

Highlights from
Generation of Random Variates

image thumbnail

Generation of Random Variates

by

James Huntley (view profile)

 

generates random variates from over 870 univariate distributions

rig_pdf(x, alpha, bet, delta)
% rig_pdf.m - evaluates a Rician Inverse Gaussian Probability Density.
%   See "Modeling the Amplitude Statistics of Ultrasonic Images", 
%   T. Eltoft, U. Tromso, IEEE Trans. Med. imaging, Vol. 25, No. 2, February, 2006.
%
%   Vector Form of PDF !!!
%
%  Created by Jim Huntley,  9/22/06
%

function [pdf] = rig_pdf(x, alpha, bet, delta)

gam = sqrt (alpha^2 - bet^2);
coef = sqrt(2) * alpha^(1.5) * delta *exp(delta*gam) / sqrt(pi);

arg = delta^2 + x.^2;
pdf = coef .* x .* besselk(1.5,alpha*sqrt(arg)) .* besseli(0,bet.*x) ./ arg.^0.75;    

return

Contact us