scatterplot

  SCATTERPLOT -- plot data points

    SCATTERPLOT (X) draws a scatter plot with a dot for each row
    in X.  If X has more than two columns then each dimension is
    plotted against each other one to form a triangular set of
    subplots in the current figure.

    OPTIONS:

    'class'     - vector containing a class label for each
              point.  If any (or all) of markercolor,
              markersize or markerstyle are cell arrays
              the label is used to index the cell array to
              set the marker appearance.
    'color'     - color for marker border and fill (if used).
              Defaults to cell array of 'ColorOrder'
              property of axes. 
    'fill'      - boolean indicating whether to fill marker
    'marker'    - marker symbol to use
    'markeredgecolor' - color for marker border: may be a string
              or [r,g,b] vector 
    'markerfacecolor' - color for marker fill: may be a string
              or [r,g,b] vector
    'markersize'    - marker size (default is 1)
    'projection'    - plot only the specified dimensions
    'shrink'    - resize the axes to exactly surround
              the points (on by default)