update help info

mech2d/main.py

@@ -69,7 +69,7 @@ def main():
     parser_post.add_argument('-i','--inputfile', type=str, default='', help="Parsing elastic constant tensor from input file")
     parser_post.add_argument('-p','--properties', type=str, default='elc', choices=['elc', 'ssc'], help="What do you want to calcuation? elastic constant or stress strain curve? default value: 'elc'.")
     parser_post.add_argument('--skip', action="store_true" , help="Whether skip the data parsing ? if true, it means the Def_*_Energy.dat should be exists in corresponding folder. default value: False.")
-    parser_post.add_argument('-o','--order', type=int, default=0, help="The order of polynomial for fitting. Default value: 4 for strain-stress approach and 3 for stress-strain method")
+    parser_post.add_argument('-o','--order', type=int, default=0, help="The order of polynomial for fitting. Default value: 4 for energy approach and 3 for stress method")
     parser_post.add_argument('-f','--fmt', type=str, default='png', help="The format of output figure. Default value: .jpg")
     parser_post.add_argument('-d','--dpi', type=int, default=100, help="The resolution of output figure. Default value: 100")
     parser_post.add_argument('--plot', action="store_true", help="plot the figures")