Section: Random Number Generation
randbeta
is
y = randbeta(alpha, beta)
where alpha
and beta
are the two parameters of the
random deviate. There are three forms for calling randbeta
.
The first uses two vectors alpha
and beta
of the same
size, in which case the output y
is the same size as both
inputs, and each deviate uses the corresponding values of alpha
and beta
from the arguments. In the other forms, either
alpha
or beta
are scalars.
for x
between 0 and 1. The function B(a,b)
is defined so
that the integral of f(x)
is 1.
a=3
,
b=7
.
--> a = 3; b = 7; --> x = (0:100)/100; t = x.^(a-1).*(1-x).^(b-1); --> t = t/(sum(t)*.01); --> plot(x,t); --> quit
which is plotted as
If we generate a few random deviates with these values,
we see they are distributed around the peak of roughly
0.25
.
--> randbeta(3*ones(1,5),7*ones(1,5)) ans = 0.2777 0.0642 0.3305 0.5259 0.4003 --> quit