polyclass object, typically the result of polyclass.

a vector of length fit\$ncov, indicating for which combination of covariates the plot should be made. Can never be omitted. Should always have length fit\$ncov, even if some values are irrelevant.

for which covariates should the plot be made. Number or a character string defining the name, if the same names were used with the call to polyclass. Which should have length one if what is 6 or larger and length two if what is 5 or smaller.

plotting limits. If omitted, the plot is made over the same range of the covariate as in the original data. Otherwise a vector of length two of the form c(min, max) if what is 6 or larger and a vector of length four of the form c(xmin, xmax, ymin ,ymax) if what is 5 or smaller.

an integer between 1 and 8, defining the type of plot to be made.

1. Plots the probability of one class as a contour plot of two variables.

2. Plots the probability of one class as a perspective plot of two variables.

3. Plots the probability of one class as an image plot of two variables.

4. Classifies the area as a contour plot of two variables.

5. Classifies the area as an image plot of two variables.

6. Classifies the line as a plot of one variable.

7. Plots the probabilities of all classes as a function of one variable.

8. Plots the probability of one class as a function of one variable.

Class for which the plot is made. Should be provided if what is 1, 2, 3 or 8.

the number of equally spaced points at which to plot the fit. The default is 250 if what is 6 or larger or 50 (which results in 2500 plotting points) if what is 5 or smaller.

axis plotting labels.

all other options are passed on.