Main calling program to read hepc data for 2 days
Program1 to read hepc data for 2 days and draw histogram
Program2 to read hepc data for 2 days and draw graph2
Program3 to read hepc data for 2 days and draw graph3
Program4 to read hepc data for 2 days and draw grap4
Plot4 from program4
Plot3 from program3
Plot2 from program2
Plot1 from program1
Merge branch 'master' of https://github.com/melabraham/ExData_Plotting1