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diff --git a/sourcecodes/bnt-master/KPMtools/mysetdiff.m b/sourcecodes/bnt-master/KPMtools/mysetdiff.m
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+++ b/sourcecodes/bnt-master/KPMtools/mysetdiff.m
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+function C = mysetdiff(A,B)
+% MYSETDIFF Set difference of two sets of positive integers (much faster than built-in setdiff)
+% C = mysetdiff(A,B)
+% C = A \ B = { things in A that are not in B }
+%
+% Original by Kevin Murphy, modified by Leon Peshkin
+
+if isempty(A)
+    C = [];
+    return;
+elseif isempty(B)
+    C = A;
+    return; 
+else % both non-empty
+    bits = zeros(1, max(max(A), max(B)));
+    bits(A) = 1;
+    bits(B) = 0;
+    C = A(logical(bits(A)));
+end