comparison toolboxes/FullBNT-1.0.7/KPMtools/compute_counts.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function count = compute_counts(data, sz)
+% COMPUTE_COUNTS Count the number of times each combination of discrete assignments occurs
+% count = compute_counts(data, sz)
+%
+% data(i,t) is the value of variable i in case t
+% sz(i) : values for variable i are assumed to be in [1:sz(i)]
+%
+% Example: to compute a transition matrix for an HMM from a sequence of labeled states:
+% transmat = mk_stochastic(compute_counts([seq(1:end-1); seq(2:end)], [nstates nstates]));
+
+assert(length(sz) == size(data, 1));
+P = prod(sz);
+indices = subv2ind(sz, data'); % each row of data' is a case 
+%count = histc(indices, 1:P);
+count = hist(indices, 1:P);
+count = myreshape(count, sz);
+