Hide numpy floating point arithmetic warnings

las_manipulation.py

@@ -159,9 +159,12 @@ def find_beach_slope(chain_list, z_ave_list, ref_index, check_value):
     while i>0 and z_ave_list[i]<check_value+1:
         i=i-1
 
-    # Hide numpy divide-by-zero warnings
+    # Hide numpy floating point arithmetic warnings
     np.seterr(all='ignore')
+
     slope=(z_ave_list[i]-z_ave_list[ref_index])/(chain_list[i]-chain_list[ref_index])
+
+    # Show numpy floating point arithmetic warnings
     np.seterr(all=None)