ggsave png错误与较大的大小 [英] ggsave png error with larger size

问题描述

 <$ 
我保存了一个刻面的ggplot2图，该图可以很好地保存在较小的尺寸上，但在我想增加它时会失败。 C $ C>> ggsave（tst.png，height = 6.75，width = 9）
＃正常工作
 
> ggsave（tst.png，height = 9，width = 12）
 grDevices :: png错误（...，width = width，height = height，res = dpi，：
无法启动设备
此外：警告消息：
 1：在grDevices :: png（...，width = width，height = height，res = dpi，：
无法分配位图
 2：在grDevices :: png（...，width = width，height = height，res = dpi，：
开启设备失败
  

以前我用ggsave保存过这个大小的png，任何想法为什么它不起作用？

可重复的例子：

  library（car）
 qplot（education，data = Vocab，geom = density，color = sex）+ facet_wrap（〜year）
  

解决方案

注意：在Windows 7 64bit上使用R 2.12.1，此问题已消失，如果遇到此问题，请先尝试更新您的R版本。

b $ b

在另一个问题中再次出现问题后，我重新输入了测试代码在我的新系统上，看看错误是否消失了，它是。

---

编辑：为什么底层代码可以工作是这样的，它使用的分辨率只有72 dpi，而不是300dpi，这是我认为的 ggsave（）中的标准。

so ggsave（tst.png，height = 9，width = 12，dpi = 72） could做的伎俩。

但是如果它不能接受它，你真的必须有一个疯狂的阴谋。据我所知，问题与显卡有关（如来自Ripley教授的这则消息）。

如果解决方案是个问题，最好使用eps或pdf等矢量化格式。

---

编辑2：

显然，某处存在涉及某种内存泄漏的错误？给出以下代码：

  library（car）
 library（ggplot2）
 qplot（education，data = Vocab，geom =density，color = sex）+ facet_wrap（〜year）
 setwd（G：/ Temp）
 i <-1 
 while（1）{
 tryCatch（ggsave（tst.png，height = 9 + i，width = 12 + i），error = function（e）{print（i）; stop（e）;}）
i< - 我+ 1 
} 
  

直到我达到9时，我得到你得到的错误。每次下一次尝试运行代码时，再次从 i = 1 开始，给出相同的错误。尝试使用 png（）和 dev.off（）会再次出现相同的错误。看起来好像有一部分内存被填满而没有被清空，有效地阻止了另一个PNG文件的保存。也对我来说 gc（）没有做任何事情。即使关闭R并再次打开也不起作用。

使用 ggsave（tst.pdf），但错误依然存在。我会向R团队汇报。


I'm saving a faceted ggplot2 plot which works fine to save at a smaller size, but fails when I want to increase it.

> ggsave("tst.png",height=6.75,width=9)
# works fine

> ggsave("tst.png",height=9,width=12)
Error in grDevices::png(..., width = width, height = height, res = dpi,  : 
  unable to start device
In addition: Warning messages:
1: In grDevices::png(..., width = width, height = height, res = dpi,  :
  Unable to allocate bitmap
2: In grDevices::png(..., width = width, height = height, res = dpi,  :
  opening device failed

I've saved pngs of this size before with ggsave, any ideas why its not working?

Reproducible example:

library(car)
qplot(education,data=Vocab,geom="density",colour=sex)+facet_wrap(~year)

解决方案

NOTE : Using R 2.12.1 on Windows 7 64bit, this problem has vanished. If you run into this problem, first try updating your R version.

After the problem came up again in another question, I reran my test code on my new system to see if the bug was gone, and it is.

---

EDIT: The trick why underlying code could work is the fact that it uses a resolution of only 72 dpi and not 300dpi as is the standard in ggsave() I believe.

so ggsave("tst.png",height=9,width=12,dpi=72) could do the trick.

But you really must have a crazy plot if it can't take it. As far as I can guess, the problem is related to the graphics card (as derived from this message from prof. Ripley ).

If resolution is a problem, you could better go to vectorized formats like eps or pdf.

---

EDIT 2 :

Apparently, there is a bug somewhere involving some kind of memory leak maybe? Give following code:

library(car)
library(ggplot2)
qplot(education,data=Vocab,geom="density",colour=sex)+facet_wrap(~year)
setwd("G:/Temp")
i<-1
while(1){
  tryCatch(ggsave("tst.png",height=9+i,width=12+i),error=function(e) {print(i);stop(e);})
  i <- i+1
}

This runs fine for me until i reaches about 9, then I get the error you get. Every next attempt at running the code, starting again with i=1, gives the same error. Trying with png() and dev.off() gives again the same error. Seems like there is some part of a memory filling up and not being emptied, effectively preventing to get another png file saved. also for me gc() didn't do a thing. Even closing R and reopening again didn't work.

It is "solved" using ggsave("tst.pdf"), but the bug remains. I'd report to the R team.

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