Sets the values that determine how a vector of continuous data is classified into categories. Called by mapCountryData() and mapGriddedData()
rwmGetClassBreaks(dataColumn, catMethod, numCats, verbose = TRUE,
midpoint = 0)A vector specifying the numeric breaks between data categories.
the data vector to be classified, must be numeric
the method to use to classify the data into categories, choice of "pretty", "fixedWidth", "diverging", "logFixedWidth","quantiles","categorical" or a numeric vector defining breaks
number of categories to put the data in, may be overidden if not possible under some classification methods
whether to print information messages to console TRUE/FALSE
the midpoint to use if catMethod='diverging', default=0
andy south and matthew staines
The classInt package