From 703d09a566fab0d93f52e352fa859f3f0db44106 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Ne=C4=8Dada?= <marek@necada.org>
Date: Tue, 11 Dec 2018 22:20:48 +0000
Subject: [PATCH] Fix reciprocal basis in lattices2d.c. New ewaldshift test
 gives results consistent with the legacy code.

Former-commit-id: e8c3ab317136614852749fd65a0c1326158eee5e
---
 qpms/lattices2d.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/qpms/lattices2d.c b/qpms/lattices2d.c
index d939471..370c99f 100644
--- a/qpms/lattices2d.c
+++ b/qpms/lattices2d.c
@@ -801,8 +801,8 @@ int l2d_reciprocalBasis1(cart2_t b1, cart2_t b2, cart2_t *rb1, cart2_t *rb2) {
     return QPMS_ERROR; // TODO more specific error code
   } else {
     rb1->x =  b2.y / det;
-    rb1->y = -b1.y / det;
-    rb2->x = -b2.x / det;
+    rb1->y = -b2.x / det;
+    rb2->x = -b1.y / det;
     rb2->y =  b1.x / det;
     return QPMS_SUCCESS;
   }