使用功能保存ggplot [英] Save ggplot with a function

问题描述

我想创建一个函数来保存绘图(来自ggplot).

I would like to create a function to save plots (from ggplot).

这是一个数据框:

### creating data frame
music <- c("Blues", "Hip-hop", "Jazz", "Metal", "Rock")
number <- c(8, 7, 4, 6, 11)
df.music <- data.frame(music, number)
colnames(df.music) <- c("Music", "Amount")

然后我创建一个情节:

### creating bar graph (this part is OK)
myplot <- ggplot(data=df.music, aes(x=music, y=number)) +
 geom_bar(stat="identity") +
 xlab(colnames(df.music)[1]) +
 ylab(colnames(df.music)[2]) +
 ylim(c(0,11)) +
 ggtitle("Ulubiony typ muzyki wśród studentów")

现在我想将此图保存到.pdf.

Now I want to save this plot to .pdf.

这有效:

pdf("Myplot.pdf", width=5, height=5)
plot.music.bad
dev.off()

但是，我想使用一个函数将其自动化，该函数将要保存的绘图作为参数. 我不知道该怎么做.这是我尝试过的:

However I would like to automate this with a function which takes as an argument the plot I want to save. I don't know exactly how to do it; here's what I have tried:

save <- function(myplot){
  plot<- myplot
  pdf("lol.pdf", width=5, height=5)
  plot
  dev.off()
}
### .pdf file is created but doesn't work
save(myplot) 

那我该怎么办?

推荐答案

您可以使用print()将由ggplot2生成的图保存到文件中.

You can use print() to save plots produced from ggplot2 to a file.

首先，定义保存图的功能:

First, define your function to save plots:

savePlot <- function(myPlot) {
        pdf("myPlot.pdf")
        print(myPlot)
        dev.off()
}

创建剧情:

 myPlot <- ggplot(ggplot(data=df.music, aes(x=music, y=number)) +
 geom_bar(stat="identity") +
 xlab(colnames(df.music)[1]) +
 ylab(colnames(df.music)[2]) +
 ylim(c(0,11)) +
 ggtitle("Ulubiony typ muzyki wśród studentów")

最后调用函数:

savePlot(myPlot)

---

或者，您可以在创建绘图后使用ggsave():

ggsave(filename="myPlot.pdf", plot=myPlot)

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