diff --git a/lu_tridiag.m b/lu_tridiag.m
index 8b13789..f147541 100644
--- a/lu_tridiag.m
+++ b/lu_tridiag.m
@@ -1 +1,6 @@
 
+function [ud,uo,lo]=lu_tridiag(e,f,g)
+
+n=size(e);
+
+end