diff toolboxes/FullBNT-1.0.7/bnt/general/unroll_higher_order_topology.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/bnt/general/unroll_higher_order_topology.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,30 @@
+function M = unroll_higher_order_topology(intra, inter, T, intra1)
+% UNROLL_DBN_TOPOLOGY Make the block diagonal adjacency matrix for a DBN consisting of T slices
+% M = unroll_dbn_topology(intra, inter, T, intra1)
+%
+% intra is the connectivity within a slice, inter between two slices.
+% M will have intra along the diagonal, and inter one above the diagonal.
+% intra1 is an optional argumnet, in case the intra is different for the first slice.
+
+if nargin < 4 
+    intra1 = intra; 
+end;
+
+
+ss = length(intra); % slice size
+M = sparse(ss*T, ss*T);
+[rows,columns,order] = size(inter);
+for t1 = 1:T
+  b = 1 + (t1 - 1)*ss : t1*ss;
+  if t1 == 1
+      M(b,b) = intra1;
+  else
+      M(b,b) = intra;
+  end
+  for t2 = 1:order
+    if t1 + t2 <= T
+      M(b,b+t2*ss) = inter(:,:,t2);
+    end
+  end
+end
+