Vertigo could be either from a peripheral (labyrinth and vestibular nerve) or a central disorder (central nervous system). Central vertigo is usually a result of an abnormal processing of the vestibular sensory input by the central nervous system. See the image below.
scatterhist(x,y) creates a 2-D scatter plot of the data in vectors x and y, and displays the marginal distributions of x and y as univariate histograms on the horizontal and vertical axes of the scatter plot, respectively. example.
The scatterplot matrix is the visual counterpart of the correlation matrix, and it should always be studied as a prelude to regression analysis if there are many variables. (Virtually all commercial regression software offers this feature, although the results vary a lot in terms of graphical quality.