如何使用自定義X軸標籤來繪製堆積區域圖表

Question

我想用自定義的X軸來繪製堆積區域圖表圖表。具體來說，我想用cex.axis = 0.8來標記x軸上的刻度標記（使它適合所有值），我想用紅色來突出顯示一些x值（例如，週末日期與平日相反）。

plotrix軟件包中的stackpoly可以很好地創建繪圖。但我無法控制cex.axis或抑制x軸繪圖。

這裏是我的兩次嘗試完成這個工作：

## dates in winter of 2014 (these are the labels for my X-axis) 
date.labels=paste(c(rep(1,2), rep(2,21)), c(30, 31, 1:21), sep = "/") 
> date.labels 
[1] "1/30" "1/31" "2/1" "2/2" "2/3" "2/4" "2/5" "2/6" "2/7" "2/8"  "2/9" "2/10" "2/11" 
[14] "2/12" "2/13" "2/14" "2/15" "2/16" "2/17" "2/18" "2/19" "2/20" "2/21" 

weekend=c(FALSE, FALSE, TRUE, TRUE, rep(FALSE, 5), TRUE, TRUE, rep(FALSE, 5), TRUE, TRUE, rep(FALSE, 5)) 

set.seed(10) 
#This is the data I want to plot 
fake.data=data.frame(abs(rnorm(23)), abs(rnorm(23)), abs(rnorm(23))) 

library("plotrix") 

#First attempt: use cex.axis in stackpoly to control font size. 
#overplot the weekend dates with red via axis() 
stackpoly(fake.data, stack=TRUE, xat=1:23, xaxlab=date.labels, cex.axis=0.8, 
     xlab="dates in 2014", sub="weekend dates are marked red") 
#stackpoly ignores cex.axis=0.8 

axis(1, (1:23)[weekend], labels= date.labels[ weekend], col.axis="red",  cex.axis=0.8) 
#but axis does not ignore cex.axis=0.8 

## Another attempt: suppress x axis altogether in stackpoly 

stackpoly(fake.data, stack=TRUE, xlim=c(1,23), xaxt="n", 
     xlab="dates in 2014", sub="weekend dates are marked red") 
#stackpoly ignores xaxt="n" 

axis(1, (1:23)[weekend], labels= date.labels[ weekend], col.axis="red", cex.axis=0.8) 
axis(1, (1:23)[!weekend], labels= date.labels [ !weekend], col.axis="black", cex.axis=0.8) 
#but axis does not ignore cex.axis=0.8 

Answer 1

嘗試呼叫前設置par(...)到stackpoly(...)

par(mfrow=c(1,2)) 
# original axis text size 
stackpoly(fake.data, stack=TRUE, xat=1:23, xaxlab=date.labels, 
      xlab="dates in 2014", sub="weekend dates are marked red") 
# smaller axis text size 
par(cex.axis=0.8) 
stackpoly(fake.data, stack=TRUE, xat=1:23, xaxlab=date.labels, 
      xlab="dates in 2014", sub="weekend dates are marked red")