From: W. Trevor King <wking@tremily.us>
Date: Fri, 22 Feb 2013 17:49:45 +0000 (-0500)
Subject: scatter: fix stupid --vx0-energy minus sign
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=ad40077b4ef3989dd78714a269fdb7a484540f4f;p=assignment-template.git

scatter: fix stupid --vx0-energy minus sign
---

diff --git a/scatter.c b/scatter.c
index ed164ae..aa50c87 100644
--- a/scatter.c
+++ b/scatter.c
@@ -343,7 +343,7 @@ void parse_args(int argc, char **argv, state_t *state, system_t *system,
 			state->x[2] = safe_strtod(optarg, "vx0");
 			break;
 		case 'e':
-			state->x[2] = -sqrt(2*safe_strtod(optarg, "vx0-energy")/system->m);
+			state->x[2] = sqrt(2*safe_strtod(optarg, "vx0-energy")/system->m);
 			break;
 		case 'Y':
 			state->x[3] = safe_strtod(optarg, "vy0");