diff --git a/func_deltG.m b/func_deltG.m
index 46bc94b..760acad 100644
--- a/func_deltG.m
+++ b/func_deltG.m
@@ -35,8 +35,8 @@ dg3_dvbi=sparse(Busnum,sizeLoadi);
 dg32_dvbi=dg3_dvbi;
 dg4_dvbi=sparse(Busnum,length(Loadi));
 dg42_dvbi=dg4_dvbi;
-dg5_dvbi=sparse(Busnum,Busnum);
-dg6_dvbi=sparse(Busnum,Busnum);
+dg5_dvbi=sparse(-eye(Busnum,Busnum));
+dg6_dvbi=sparse(eye(Busnum,Busnum));
 dg7_dvbi=sparse(eye(Busnum,Busnum));
 dgPDbi_dvbi=sparse(Busnum,sizeLoadi);
 %%