From 38e49bf4fd07cf2dc20c913bf15980c7e86eff1b Mon Sep 17 00:00:00 2001
From: Ed Bueler <elbueler@alaska.edu>
Date: Sun, 7 May 2023 13:21:22 -0800
Subject: [PATCH] find and fix lower-bound bug in c/ch12/solns/elasto.c

---
 c/ch12/solns/elasto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/c/ch12/solns/elasto.c b/c/ch12/solns/elasto.c
index f47d6e23..e1781e0c 100644
--- a/c/ch12/solns/elasto.c
+++ b/c/ch12/solns/elasto.c
@@ -132,7 +132,7 @@ PetscErrorCode FormBounds(SNES snes, Vec Xl, Vec Xu) {
   DMDALocalInfo  info;
   PetscInt       i, j;
   PetscReal      **aXu, dx, dy, x, y;
-  PetscCall(VecSet(Xu,PETSC_NINFINITY));
+  PetscCall(VecSet(Xl,PETSC_NINFINITY));
   PetscCall(SNESGetDM(snes,&da));
   PetscCall(DMDAGetLocalInfo(da,&info));
   dx = 1.0 / (PetscReal)(info.mx-1);