在match.arg {base}的例子中,
require(stats)## Extends the example for 'switch'center <- function(x, type = c("mean", "median", "trimmed")) { type <- match.arg(type) switch(type, mean = mean(x), median = median(x), trimmed = mean(x, trim = .1))}x <- rcauchy(10)center(x, "t") # Workscenter(x, "med") # Works这个后面的center(x, "t")是如何调用的?t是什么?