Specify the color of background for drawing plots.
This color is used to fill the rectangle in which the plot is drawn.
Color can be specified as (a) an object of the type
java.awt.Color , (b) a three element vector of doubles with every element between zero and one or (c) a theree element vector with every element between zero and
255 . In the latter cases, the elements define the
blue components of the color.
>>setPlotBGColor([.9 .9 .8])