Merge pull request #1 from ziejd2/octave_php_separate

Octave php separate

1 files changed, 19 insertions, 0 deletions

diff --git a/sourcecodes/bnt-master/graph/mk_rooted_tree.m b/sourcecodes/bnt-master/graph/mk_rooted_tree.m
new file mode 100644
index 00000000..396043eb
--- /dev/null
+++ b/sourcecodes/bnt-master/graph/mk_rooted_tree.m
@@ -0,0 +1,19 @@
+function [T, pre, post, cycle] = mk_rooted_tree(G, root)
+% MK_ROOTED_TREE Make a directed tree pointing away from root
+% [T, pre, post, cycle] = mk_rooted_tree(G, root)
+
+n = length(G);
+T = sparse(n,n); % not the same as T = sparse(n) !
+directed = 0;
+[d, pre, post, cycle, f, pred] = dfs(G, root, directed);
+[junk, pre2] = sort(d);
+assert(isequal(pre, pre2))
+[junk, post2] = sort(f);
+assert(isequal(post, post2));
+%[d, pre, post, cycle, f, pred] = dfs(G, [], directed);
+for i=1:length(pred)
+  if pred(i)>0
+    T(pred(i),i)=1;
+  end
+end
+