最小/最大的平均线和阴影的线图

Question

我已经为此制作了一个快速示例数据框。基本上我想创建一个线图，其平均值为一条线，并且该线周围的阴影代表值的范围。我意识到我可能必须找到行最小值/最大值，但我不确定如何为行执行此操作，也不知道如何绘制此行

TEST <- data.frame(a=c(1,5,7,2), b=c(3,8,2,5), c=c(6,10,2,1))
TEST$mean <- rowMeans(TEST)

感谢任何帮助 - 谢谢

Answer 1

也可以轻松完成基础R，但这里采用ggplot方法

添加Min和Max以及x轴的某些索引

TEST <- transform(TEST, Min = pmin(a,b,c), Max = pmax(a,b,c), indx = seq_len(dim(TEST)[1]))

使用geom_ribbon

绘图

library(ggplot2)
ggplot(TEST) +
geom_line(aes(indx, mean), group = 1) +
geom_ribbon(aes(x = indx, ymax = Max, ymin = Min), alpha = 0.6, fill = "skyblue")

Answer 2

只是添加另一个选项，这里只使用基础R：

是一个可能的解决方案

TEST <- data.frame(a=c(1,5,7,2), b=c(3,8,2,5), c=c(6,10,2,1))

# compute mean, min and max of rows
means <- rowMeans(TEST)
maxs <- apply(TEST,1,max)
mins <- apply(TEST,1,min)

# create x-coordinates
xcoords <- 1:nrow(TEST)

# create an empty plot to make space for everything 
plot(x=c(min(xcoords),max(xcoords)),y=c(min(mins),max(maxs)),
     type="n", main="Average",xlab="X",ylab="Y")

# add min-max ranges (color is DodgerBlue with 80/255 of opacity, 
# for rgb values of colors see http://en.wikipedia.org/wiki/Web_colors)
rangecolor <- rgb(30,144,255,alpha=80,maxColorValue=255)
polygon(x=c(xcoords,rev(xcoords)),y=c(maxs,rev(means)),col=rangecolor,border=NA)
polygon(x=c(xcoords,rev(xcoords)),y=c(mins,rev(means)),col=rangecolor,border=NA)

# add average line (black)
meancolor <- "black"
lines(x=xcoords,y=means,col=meancolor)

结果：

为了将来重用，您还可以将其包装成一个有用的功能：

plotLineWithRange <- function(x, yVal, yMin, yMax,
                          lineColor="Black", rangeColor="LightBlue",
                          main="", xlab="X", ylab="Y"){
  if(missing(x)){
    x <- 1:length(yVal)
  }
  stopifnot(length(yVal) == length(yMin) && length(yVal) == length(yMax))

  plot(x=c(min(x),max(x)),y=c(min(yMin),max(yMax)),type="n", main=main,xlab=xlab,ylab=ylab)
  polygon(x=c(x,rev(x)),y=c(yMax,rev(yVal)),col=rangeColor,border=NA)
  polygon(x=c(x,rev(x)),y=c(yMin,rev(yVal)),col=rangeColor,border=NA)
  lines(x=x,y=yVal,col=lineColor)
}


# usage example:
plotLineWithRange(yVal=means,yMin=mins,yMax=maxs,main="Average")