From 39996be82e1b3e6ce9bd9ff35744fc2ce45889ef Mon Sep 17 00:00:00 2001
From: vijay gopal chilkuri <vijay.gopal.c@gmail.com>
Date: Wed, 21 Dec 2016 11:56:39 +0100
Subject: [PATCH] add error checking

---
 src/ex1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ex1.c b/src/ex1.c
index 9dfdf05..88f7721 100644
--- a/src/ex1.c
+++ b/src/ex1.c
@@ -221,7 +221,7 @@ int main(int argc,char **argv)
 	  ierr = VecNorm(xr, NORM_2, &norm);CHKERRQ(ierr);
 	  PetscPrintf(PETSC_COMM_WORLD," Norm = %18f \n", (double)norm);
   	  for (i=Istart; i<Iend; i+=getdata.nnz) {
-		  ierr = VecGetValues(xr, 1, i, value);
+		  ierr = VecGetValues(xr, 1, i, value);CHKERRQ(ierr)
 		  PetscPrintf(PETSC_COMM_WORLD," Element # = %d Value = %18f \n", i, value[0]); 
 	  }