BNW using Octave instead of Matlab.

This version of BNW should perform the same as the original version. The only difference is that it uses Octave instead of Matlab when running BayesNet Toolbox during parameter learning.

I am calling this BNW_1.02. It can be accessed at:
compbio.uthsc.edu/BNW_1.02

1 files changed, 18 insertions, 0 deletions

diff --git a/sourcecodes/bnt-master/KPMstats/dirichlet_sample.m b/sourcecodes/bnt-master/KPMstats/dirichlet_sample.m
new file mode 100644
index 00000000..2ab09afb
--- /dev/null
+++ b/sourcecodes/bnt-master/KPMstats/dirichlet_sample.m
@@ -0,0 +1,18 @@
+function theta = dirichlet_sample(alpha, N)
+% SAMPLE_DIRICHLET Sample N vectors from Dir(alpha(1), ..., alpha(k))
+% theta = sample_dirichlet(alpha, N)
+% theta(i,j) = i'th sample of theta_j, where theta ~ Dir
+
+% We use the method from p. 482 of "Bayesian Data Analysis", Gelman et al.
+
+assert(alpha > 0);
+k = length(alpha);
+theta = zeros(N, k);
+scale = 1; % arbitrary
+for i=1:k
+  %theta(:,i) = gamrnd(alpha(i), scale, N, 1);
+  theta(:,i) = gamma_sample(alpha(i), scale, N, 1);
+end
+%theta = mk_stochastic(theta);
+S = sum(theta,2); 
+theta = theta ./ repmat(S, 1, k);