1 files changed, 12 insertions, 2 deletions
diff --git a/scripts/random-muscle-activation.py b/scripts/random-muscle-activation.py
index fb225cc..a4031fa 100755
--- a/scripts/random-muscle-activation.py
+++ b/scripts/random-muscle-activation.py
@@ -137,12 +137,22 @@ def main():
 
     if N <= 0:
         print("Error: invalid number of data points ({}), must be > 0".format(N))
-        usage()
+        sys.exit(-1)
+
+    if not xmin < xmax:
+        print("Error: xmin must be smaller than xmax")
+        sys.exit(-1)
+
+    if not ymin < ymax:
+        print("Error: ymin must be smaller than ymax")
+        sys.exit(-1)
+
+    if not ydmin <= ydmax:
+        print("Error: ydmin must be smaller than or equal to ydmax")
         sys.exit(-1)
 
     if len(args) < 1:
         print("Error: no output file(s) specified")
-        usage()
         sys.exit(-1)
 
     for a in args: