在R中，对Zipf(频率与等级)绘图的命令是什么

I have from a network traffic data, data volume (# of bytes) and # of flows over a week period for origin and destination IP pair. I want to plot distribution, i.e. frequency against rank. I believe that there is a function already provided by R for that. What is it and how to use that function for my scenario.I have from a network traffic data, data volume