here is an article written by nivedh

http://www.goiit.com/posts/list/community-shelf-for-beginners-plotting-and-analyzing-a-graph-29527.htm

http://www.goiit.com/posts/list/community-shelf-learning-graphs-part-2-c-this-itz-worth-it-45796.htm

don't forget to rate me if those helps.