The dataframe containing the items to show in the scatterMatrix.
cols
The variable names of the variables to place on the columns.
rows
The variable names of the variables to place on the rows.
theme
Which ggplot theme to use.
autoSize
Whether to resize the plot depending on the viewport (i.e. device that is
being drawn to) or whether to use the four measurements specified below
(txtHeight, histHeight, scatterWidth, and scatterHeight)
to size the plot.