循环未完成保存pdf [英] Loop does not finish saving pdf
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问题描述
我正在编写一个循环.循环的目的是创建许多图并将其另存为 PDF
.选择数据的一个子集后,请执行以下操作:
I am writing a loop. The purpose of the loop is to create many plots and save them as a PDF
. After selecting a subset of my data I do the following:
pdf("path to the desired filename", width = 16, height = 7)
some ggplot operations...
dev.off()
如果我为要绘制的所有数据子集手动执行此操作,则它本身可以工作.如果我循环尝试, PDF
设备会保存很多空"图片.
This in itself works if I do it manually for all the subsets of data that I want to plot. If I try this in a loop the PDF
device saves a lot of "empty" pictures.
我不明白为什么这不能循环工作.似乎循环不会等到绘图已正确导出.
I don't understand why this will not work in a loop. It seems like the loop does not wait until the plot has been properly exported.
推荐答案
这是一个常见问题.您需要在for循环中使用 print(...)
.
This is a common problem. You need to use print(...)
inside a for loop.
pdf("myfile.pdf")
for (i in 1:2) {
ggplot(mpg, aes(x=cty, y=hwy))+geom_point()
}
dev.off() # myfile.pdf is empty (no pages)
pdf("myfile.pdf")
for (i in 1:2) {
print(ggplot(mpg, aes(x=cty, y=hwy))+geom_point())
}
dev.off() # myfile.pdf has 2 pages.
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