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