title: R histogram - too many variables
body: <p>I am trying to illustrate a histogram of 33 different variables. Due to the number of variables I think "beside" different Colors I need to label each bar in a clear way, even using an arrow, if its doable.</p>
  
  <p>I was wondering about 
  1) How can I define 33 distinct color in R
  2) How can I label them, say vertical below X axis with a certain distance from each other to make my figure more clear.</p>
  
  <p>I am using multhist function from Plotrix package, and for data you can image just 33 random vector with different length !</p>
  
  <p>Thanks</p>