使用带有对象名称的变量保存对象

问题描述

可能的重复:
如何使用特定变量名保存() >

我想知道在 R 中保存对象的简单方法是使用变量 objectName 和要保存的对象的名称.我希望这样可以轻松保存对象，并在文件名中使用它们的名称.

I'm wondering what an easy way is to save an object in R, using a variable objectName with the name of the object to be saved. I want this to easy save objects, with their name in the file name.

我尝试使用 get，但我没能用它的原始对象名称保存对象.

I tried to use get, but I didn't manage to save the object with it's original object name.

示例:

如果我有一个名为temp"的对象，我想将其保存在目录dataDir"中.我将对象的名称放在变量objectName"中.

If I have the object called "temp", which I want to save in the directory "dataDir". I put the name of the object in the variable "objectName".

尝试 1:

objectName<-"temp"
save(get(objectName), file=paste(dataDir, objectName, ".RData", sep=""))
load(paste(dataDir, objectName, ".RData", sep=""))

这不起作用，因为 R 试图保存一个名为 get(objectName) 的对象，而不是这个调用的结果.所以我尝试了以下方法:

This didn't work, because R tries to save an object called get(objectName), instead of the result of this call. So I tried the following:

尝试 2:

objectName<-"temp"
object<-get(objectName)
save(object, file=paste(dataDir, objectName, ".RData", sep=""))
load(paste(dataDir, objectName, ".RData", sep=""))

这显然不起作用，因为 R 以名称object"保存对象，而不是以名称temp"保存对象.加载后我有一个对象"的副本，而不是临时".(是的，内容相同……但这不是我想要的:)).所以我认为它应该是带有指针的东西.所以尝试了以下方法:

This obviously didn't work, because R saves the object with name "object", and not with name "temp". After loading I have a copy of "object", instead of "temp". (Yes, with the same contents...but that is not what I want :) ). So I thought it should be something with pointers. So tried the following:

尝试 3:

objectName<-"temp"
object<<-get(objectName)
save(object, file=paste(dataDir, objectName, ".RData", sep=""))
load(paste(dataDir, objectName, ".RData", sep=""))

与尝试 2 的结果相同.但我不确定我在做什么我认为我在做什么.

Same result as attempt 2. But I'm not sure I'm doing what I think I'm doing.

对此有什么解决方案?

推荐答案

尝试 save(list=objectName, file=paste(objectName, '.Rdata', sep='') ).

关键是 save 的 list 参数需要一个字符串列表，它是要保存的对象的名称(而不是通过 ).

The key is that the list argument to save takes a list of character strings that is the names of the objects to save (rather than the actual objects passed through ...).

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