updated plot commands for figure 2-2
updated plot commands for figure 2-2

heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed,heineman/algorithms-nutshell-2ed