data_array, min_value, max_value, nbin, <draw_axes>
Plot a histogram of data values in an array.

PARAMETERS
----------

data_array    -   The array whose histogram is to be plotted.

min_value     -   The minimum value to bin.

max_value     -   The maximum value to bin.

nbin          -   The number of histogram bins between
                  min_value and max_value.

draw_axes     -   If this is true then a new plot will be started
                  with axes suitable for the histogram.
                  If this is false then the histogram will be drawn
                  within the current plot.