如何在for循环中重命名数据帧 [英] How do I rename a data-frame in a for-loop
问题描述
read.tucson
函数中的树木年代学程序库读取文件。虽然我使用的是特定的包,但我想我的问题是相当普遍的:在循环中,我想通过连接 t
与每个单独的文件名称。所以,如果我的目录中有一个名为2503
的文件,我想在R中创建一个名为t2503
。接下来,我想读取使用 r.tucson
函数到每个数据帧的数据。而不是分配读入数据到数据帧,我只是用数据覆盖连接。有人可以帮我找出我失踪的步骤吗?
这是我想要使用的代码:
#set到适当的目录
setwd(C:/ work)
#获取目录中的文件列表
文件< --list.files()
numfiles< - 长度(文件)
for(i in 1:numfiles)
{
name< -paste (t,files [i],sep =)
name< -read.tucson(files [i],header = NULL)
}
我想你自己给了答案:你必须使用?assign
。
尝试类似的方法:
assign(paste0(DF,i),data.frame(A = rnorm(10),B = rnorm(10)))
}
循环遍历从1到5的整数,并创建五个数据框架DF1到DF5 。对于你的例子,你应该只替换
name< -read.tucson(files [i],header = NULL)
与
assign(name,read.tucson(files [i],header = NULL))
,但是,
name
是R中的一个基本函数,所以我会使用另一个命名约定或者跳过第一行:
$ b $ (b)($ t $ t $ t $ t $ t $ t $ t $ t $ t $ t $
我希望这就是您要找的。 p>
I am very new to programming with R, but I am trying to read in multiple files for a directory and give them each a unique name. I am reading the files in using the Dendrochronology Program Library in R (package dpIR) and the read.tucson
function. Although I'm using a specific package, I think my question is fairly general:
Within the loop, I want to create files by concatenating a "t"
with each individual files name. So, if I have a file named "2503"
in my directory, I want to create a dataframe in R called "t2503"
. Next, I want to read the data in using the r.tucson
function to each dataframe. Rather than assigning the read-in data to the dataframe, I'm just overwriting the concatenation with the data. Can someone help me figure out what step I am missing?
Here is the code I am trying to use:
#set to appropriate directory
setwd("C:/work")
#get a list of files in the directory
files <- list.files()
numfiles <- length(files)
for (i in 1:numfiles)
{
name<-paste("t",files[i],sep="")
name<-read.tucson(files[i],header=NULL)
}
I think you gave the answer yourself: you have to use ?assign
.
Try something like that:
for (i in 1:5) {
assign(paste0("DF", i), data.frame(A=rnorm(10), B=rnorm(10)))
}
This loops through the integers from 1 to 5 and creates five data.frames "DF1" to "DF5". For your example, you should just replace
name<-read.tucson(files[i],header=NULL)
with
assign(name, read.tucson(files[i],header=NULL))
Note, however, that name
is a base function in R, so I would use another naming convention or just skip the first line:
assign(paste("t",files[i],sep=""), read.tucson(files[i],header=NULL))
I hope this is what you are looking for.
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