R菜鸟，请教一个请教一个有关R程序中pdf()的问题，pdf()使用后，pdf文档在哪里？
比如使用下面这个官网上的例子

Examples## Not run: ## Test function for encodingsTestChars <- function(encoding = "ISOLatin1", ...){    pdf(encoding = encoding, ...)    par(pty = "s")    plot(c(-1,16), c(-1,16), type = "n", xlab = "", ylab = "",         xaxs = "i", yaxs = "i")         title(paste("Centred chars in encoding", encoding))    grid(17, 17, lty = 1)    for(i in c(32:255)) {        x <- i %% 16        y <- i %/% 16        points(x, y, pch = i)    }    dev.off()}## there will be many warnings.TestChars("ISOLatin2")## this does not view properly in older viewers.TestChars("ISOLatin2", family = "URWHelvetica")## works well for viewing in gs-based viewers, and often in xpdf.## End(Not run) 运行以后，pdf文档在哪里？谢谢！