function?x?=?gengamma（alpha?beta）

if?（alpha==1）
???x?=?-log（1-rand（11））/beta;
???return
end
flag=0;???????%?teste?si?alpha<1?ou?alpha>1
if?（alpha<1）
???flag=1;
???alpha=alpha+1;
end
gamma=alpha-1;
eta=sqrt（2.0*alpha-1.0）;
c=.5-atan（gamma/eta）/pi;
aux=-.5;
while（aux<0）
???y=-.5;
???while（y<=0）
??????u=rand（11）;??
??????y?=?gamma?+?eta?*?tan（pi*（u-c）+c-.5）;
???end
???v=-log（rand（11））;
???aux=v+log（1.0+（（y-gamma）/eta）^2）+gamma*log（y/gamma）-y+gamma;
end;

if?（flag==1）
???x?=?y/beta*（rand（1））^（1.0/（alpha-1））;
else
???x?=?y/beta;
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????目錄??????????0??2007-03-29?20:28??MCMC

?????文件????????539??2007-03-29?20:27??MCMC\gengamma.m

?????文件???????2277??2007-03-29?20:26??MCMC\radialBirth.m

?????文件???????1988??2007-03-29?20:26??MCMC\radialDeath.m

?????文件???????3570??2007-03-29?20:26??MCMC\radialMerge.m

?????文件???????2629??2007-03-29?20:26??MCMC\radialRW.m

?????文件???????3115??2007-03-29?20:27??MCMC\radialSplit.m

?????文件???????2638??2007-03-29?20:26??MCMC\radialUpdate.m

?????文件????????301??2007-03-29?20:27??MCMC\rjCubic.m

?????文件???????4658??2007-03-29?20:28??MCMC\rjdemo1.asv

?????文件???????4658??2007-03-29?20:28??MCMC\rjdemo1.m

?????文件????????396??2007-03-29?20:27??MCMC\rjGaussian.m

?????文件????????315??2007-03-29?20:27??MCMC\rjMultiquadric.m

?????文件???????8225??2007-03-29?20:27??MCMC\rjnn.m

?????文件????????300??2007-03-29?20:27??MCMC\rjtpSpline.m

?????文件????????218??2007-01-22?19:53??www.pudn.com.txt

-----------?---------??----------?-----??----

????????????????35827????????????????????16