title: Plotting arrows with different color in matplotlib
body: <p>I have a two dimensional array with 5 columns and some number of rows. The different columns have the following entries<code>x1 y1 x2 y2 z</code>
  I want to plot an arrow from (x1,y1) to (x2,y2) and the color of the arrow should be taken from z column corresponding to some inbuilt colormap.
  How can I do this matplotlib/python?</p>