Added source Matlab code for reference

matlab/graph/@phyTree/private/Opttf.m

@@ -0,0 +1,31 @@
+function tf = opttf(pval)
+%OPTTF determines whether input options are true or false
+
+% Copyright 2003-2004 The MathWorks, Inc.
+% $Revision: 1.3.4.2 $   $Date: 2004/12/24 20:42:39 $
+
+
+if islogical(pval)
+    tf = all(pval);
+    return
+end
+if isnumeric(pval)
+    tf = all(pval~=0);
+    return
+end
+if ischar(pval)
+    truevals = {'true','yes','on','t'};
+    k = any(strcmpi(pval,truevals));
+    if k
+        tf = true;
+        return
+    end
+    falsevals = {'false','no','off','f'};
+    k = any(strcmpi(pval,falsevals));
+    if k
+        tf = false;
+        return
+    end
+end
+% return empty if unknown value
+tf = logical([]);