A 2D Gaussian distribution density grid in the form of a ggplot object
PCMPlotGaussianDensityGrid2D(mu, Sigma, xlim, ylim, xNumPoints = 100,
yNumPoints = 100, ...)
numerical mean vector of length 2
numerical 2 x 2 covariance matrix
numerical vectors of length 2
integers denoting how many points should the grid contain for each axis.
additional arguments passed to ggplot
a ggplot object