public static PlotCanvas plot(double[][] data, Line.Style style) {
        return plot(null, data, style);
    }
public static PlotCanvas plot ( double [ ] [ ] data , Line . Style style ) { return plot ( null , data , style ) ; }
Create a plot canvas with the poly line plot of given data.
@param data a n-by-2 or n-by-3 matrix that describes coordinates of points.
@param style the stroke style of line.