R 学习笔记《十一》 R语言初学者指南--图形工具(续)

1 多组图

setwd("E:/R/R-beginer-guide/data/RBook")
    Benthic <- read.table(file="RIKZ2.txt",header = TRUE)
    pairs(Benthic[,2:9])

效果：

上图每个图形都重复了一遍

解决：

pairs(Benthic[,2:9],diag.panel=panel.hist,
          upper.panel=panel.smooth,
          lower.panel=panel.cor)

在R控制台中执行报错：

+           lower.panel=panel.cor)
错误于pairs.default(Benthic[, 2:9], diag.panel = panel.list, upper.panel = panel.smooth,  : 
  找不到对象'panel.cor'

解决这个错误

手下在控制台敲入：

? pairs

弹出的页面中可以找到两函数

第一个

panel.hist <- function(x, ...)
{
    usr <- par("usr"); on.exit(par(usr))
    par(usr = c(usr[1:2], 0, 1.5) )
    h <- hist(x, plot = FALSE)
    breaks <- h$breaks; nB <- length(breaks)
    y <- h$counts; y <- y/max(y)
    rect(breaks[-nB], 0, breaks[-1], y, col="cyan", ...)
}

第二个

panel.cor <- function(x, y, digits=2, prefix="", cex.cor, ...)
{
    usr <- par("usr"); on.exit(par(usr))
    par(usr = c(0, 1, 0, 1))
    r <- abs(cor(x, y))
    txt <- format(c(r, 0.123456789), digits=digits)[1]
    txt <- paste(prefix, txt, sep="")
    if(missing(cex.cor)) cex.cor <- 0.8/strwidth(txt)
    text(0.5, 0.5, txt, cex = cex.cor * r)
}

错误心中报的是

找不到对象'panel.cor'

因此在R控制台执行第二个函数

然后在执行pair函数就可得到正确的效果图

2 协同图

实战1

coplot(Richness ~ NAP | as.factor(Beach),pch=19,data=Benthic)

效果：

实战2

coplot(Richness ~ NAP | grainsize,pch=19,data=Benthic)

效果略

实战3

panel.lm=function(x,y,...)
    {
      tmp <- lm(y ~ x,na.action = na.omit)
      abline(tmp)
      points(x,y,...)
    }
    coplot(Richness ~ NAP |as.factor(Beach),
          pch=19,panel=panel.lm,data = Benthic)

实战4 两个条件变量的协同图

pHEire <- read.table(file="SDI2003.txt",header = TRUE)       
   pHEire$LOGAlt <- log10(pHEire$Altitude)
   pHEire$fForested <- factor(pHEire$Forested)
   coplot(pH ~ SDI | LOGAlt * fForested,
          panel=panel.lm,data=pHEire)

实战5

pHEire$Temp2 <- cut(pHEire$Temperature,breaks=2)
   pHEire$Temp2.num <- as.numeric(pHEire$Temp2)
   coplot(pH ~ SDI | LOGAlt*fForested,
          panel=panel.lm,data = pHEire,
          number = 3,cex=1.5,pch=19,
          col = gray(pHEire$Temp2.num/3))

3 组合不同类型的图

MyLayOut <- matrix(c(2,0,1,3),nrow=2,ncol=2,byrow=TRUE)
  MyLayOut
  nf <- layout(mat = MyLayOut,widths = c(3,1),
            heights = c(1,3),respect = TRUE)
  show(nf)
  xrange <- c(min(Benthic$NAP),max(Benthic$NAP))
  yrange <- c(min(Benthic$Richness),max(Benthic$Richness))
  #First graph
  par(mar = c(4,4,2,2))
  plot(Benthic$NAP,Benthic$Richness ,
      frame.plot = FALSE,xlim = xrange,ylim = yrange,ylab = "Richness")
  
  #Second graph
  par(mar = c(0,3,1,1))
  boxplot(Benthic$NAP,horizontal=TRUE,axes = FALSE,
         frame.plot = FALSE,ylim= xrange,space = 0)
         
  #Third graph
  par(mar=c(3,0,1,1))
  boxplot(Benthic$Richness,axes = FALSE,ylim = yrange,space = 0,horiz= TRUE)