Plots the discriminant as given by the mapping W on predefined axis, typically set by scatterd. Discriminants are defined by the points where class differences for mapping values are zero.
S is the plot string, e.g. S = 'b--'. In case S = 'col' a color plot is produced filling the regions of different classes with different colors. Default S = 'k-';
LINE_WIDTH sets the width of the lines and box. Default LINE_WIDTH = 1.5
In W a cell array of classifiers may be given. In S a set of plot strings of appropriate size may be given. Automatically a legend is added to the plot.
The linear gridsize is read from the global parameter GRIDSIZE, that
Examples in PREX_CONFMAT, PREX_PLOTC