Change breaks in a "classIntervals" object
Because "classIntervals" objects of style "hclust" or "bclust" contain hierarchical classification trees in their "par" attribute, different numbers of classes can be chosen without repeating the initial classification. This function accesses the "par" attribute and modifies the "brks" member of the returned "classIntervals" object.
getBclustClassIntervals(clI, k) getHclustClassIntervals(clI, k)
clI |
a "classIntervals" object |
k |
number of classes required |
a "classIntervals" object with a "modified" attribute set
Roger Bivand <Roger.Bivand@nhh.no>
if (!require("spData", quietly=TRUE)) {
message("spData package needed for examples")
run <- FALSE
} else {
run <- TRUE
}
if (run) {
data(jenks71, package="spData")
pal1 <- c("wheat1", "red3")
opar <- par(mfrow=c(2,2))
hCI5 <- classIntervals(jenks71$jenks71, n=5, style="hclust", method="complete")
plot(attr(hCI5, "par"))
plot(hCI5, pal=pal1, main="hclust k=5")
plot(getHclustClassIntervals(hCI5, k=7), pal=pal1, main="hclust k=7")
plot(getHclustClassIntervals(hCI5, k=9), pal=pal1, main="hclust k=9")
par(opar)
}
if (run) {
set.seed(1)
bCI5 <- classIntervals(jenks71$jenks71, n=5, style="bclust")
plot(attr(bCI5, "par"))
}
if (run) {
opar <- par(mfrow=c(2,2))
plot(getBclustClassIntervals(bCI5, k=3), pal=pal1, main="bclust k=3")
plot(bCI5, pal=pal1, main="bclust k=5")
plot(getBclustClassIntervals(bCI5, k=7), pal=pal1, main="bclust k=7")
plot(getBclustClassIntervals(bCI5, k=9), pal=pal1, main="bclust k=9")
par(opar)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.