From 19a8c38bb7bd6c5b90adc828ece2120f35ffbe45 Mon Sep 17 00:00:00 2001
From: Florian Burgener <florian.burgener@etu.hesge.ch>
Date: Wed, 13 Apr 2022 11:17:48 +0200
Subject: [PATCH] Fix direction of substractioin

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

diff --git a/src/charge.c b/src/charge.c
index 06f27ec..cee47b5 100644
--- a/src/charge.c
+++ b/src/charge.c
@@ -38,7 +38,7 @@ charge_t charge_create(double q, vector2_t pos) {
 
 bool compute_e(charge_t c, vector2_t p, double eps, vector2_t *e) {
     *e = vector2_create_zero();
-    vector2_t r = vector2_substract(p, c.pos);
+    vector2_t r = vector2_substract(c.pos, p);
     double norm_r = vector2_norm(r);
     double E_i = K * (fabs(c.q) / (norm_r * norm_r));
     *e = vector2_multiply(vector2_normalize(r), E_i);
-- 
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