R错误“找不到函数'multiplot'”使用Cookbook示例答案

【问题标题】：R error "could not find function 'multiplot' " using Cookbook exampleR错误“找不到函数'multiplot'”使用Cookbook示例
【发布时间】：2014-06-24 13:03:05
【问题描述】：

想在一页上绘制两个 ggplots。以Cookbook for R 为例，它不起作用。错误是could not find function "multiplot"。

然而 ggplots 是可绘制的，我也重新安装了 R、ggplot2、重新启动等。我做错了吗？

library(ggplot2)

# This example uses the ChickWeight dataset, which comes with ggplot2
# First plot
p1 <- 
  ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet, group=Chick)) +
  geom_line() +
  ggtitle("Growth curve for individual chicks")

# Second plot
p2 <- 
  ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet)) +
  geom_point(alpha=.3) +
  geom_smooth(alpha=.2, size=1) +
  ggtitle("Fitted growth curve per diet")

# Third plot
p3 <- 
  ggplot(subset(ChickWeight, Time==21), aes(x=weight, colour=Diet)) +
  geom_density() +
  ggtitle("Final weight, by diet")

# Fourth plot
p4 <- 
  ggplot(subset(ChickWeight, Time==21), aes(x=weight, fill=Diet)) +
  geom_histogram(colour="black", binwidth=50) +
  facet_grid(Diet ~ .) +
  ggtitle("Final weight, by diet") +
  theme(legend.position="none")        # No legend (redundant in this graph)    

multiplot(p1, p2, p3, p4, cols=2)

【问题讨论】：

cookbook-r.com/Graphs/Multiple_graphs_on_one_page_%28ggplot2%29 "最简单的方法是使用本页底部定义的 multiplot 函数。"
FWIW grid.arrange(p1, p2, p3, p4, ncol=2) 可能会更方便，因为它包含在一个包 (gridExtra) 中。

标签： r ggplot2 syntax-error

【解决方案1】：

引用您链接到的页面：

最简单的方法是使用本页底部定义的 multiplot 函数。如果不适合你的需要，你可以复制修改。

代码是：

# Multiple plot function
#
# ggplot objects can be passed in ..., or to plotlist (as a list of ggplot objects)
# - cols:   Number of columns in layout
# - layout: A matrix specifying the layout. If present, 'cols' is ignored.
#
# If the layout is something like matrix(c(1,2,3,3), nrow=2, byrow=TRUE),
# then plot 1 will go in the upper left, 2 will go in the upper right, and
# 3 will go all the way across the bottom.
#
multiplot <- function(..., plotlist=NULL, file, cols=1, layout=NULL) {
  require(grid)

  # Make a list from the ... arguments and plotlist
  plots <- c(list(...), plotlist)

  numPlots = length(plots)

  # If layout is NULL, then use 'cols' to determine layout
  if (is.null(layout)) {
    # Make the panel
    # ncol: Number of columns of plots
    # nrow: Number of rows needed, calculated from # of cols
    layout <- matrix(seq(1, cols * ceiling(numPlots/cols)),
                    ncol = cols, nrow = ceiling(numPlots/cols))
  }

 if (numPlots==1) {
    print(plots[[1]])

  } else {
    # Set up the page
    grid.newpage()
    pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))

    # Make each plot, in the correct location
    for (i in 1:numPlots) {
      # Get the i,j matrix positions of the regions that contain this subplot
      matchidx <- as.data.frame(which(layout == i, arr.ind = TRUE))

      print(plots[[i]], vp = viewport(layout.pos.row = matchidx$row,
                                      layout.pos.col = matchidx$col))
    }
  }
}

【讨论】：

【解决方案2】：

有人很好，将 multiplot 函数放在 Rmisc 包中，所以你也可以使用它。

【讨论】：

【解决方案3】：

将此脚本保存在您的本地目录中并获取它源（“..../multiplot.R”）然后，您将能够创建多个地块

multiplot <- function(..., plotlist = NULL, file, cols = 1, layout = NULL) {
  require(grid)

  plots <- c(list(...), plotlist)

  numPlots = length(plots)

  if (is.null(layout)) {
    layout <- matrix(seq(1, cols * ceiling(numPlots/cols)),
                 ncol = cols, nrow = ceiling(numPlots/cols))
}

if (numPlots == 1) {
print(plots[[1]])

} else {
grid.newpage()
pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))

for (i in 1:numPlots) {
  matchidx <- as.data.frame(which(layout == i, arr.ind = TRUE))

  print(plots[[i]], vp = viewport(layout.pos.row = matchidx$row,
                                  layout.pos.col = matchidx$col))
 }
}
 }

【讨论】：

【解决方案4】：

如果你不想包含multiplot 函数，你可以使用这个：

install.packages("gridExtra")
library("gridExtra")
grid.arrange(g1, g2)

【讨论】：

【解决方案5】：

除了Rmisc和gridExtra，包easyGgplot2也有multiplot()功能。

【讨论】：