[英]Accessing a sub directory in a R package
I have a data folder in an R package. 我在R包中有一个数据文件夹。 With in the the data directory I have a sub directory data/JE.
在数据目录中我有一个子目录data / JE。 I want to access this directory and apply list.file function and then using the list I want to read each file.
我想访问此目录并应用list.file函数,然后使用我想要读取每个文件的列表。 I can setwd() when not running the package.
不运行包时我可以setwd()。 But while the package is running I don't know how to access the directory.
但是当程序包运行时我不知道如何访问该目录。
JESP = system.file("data/JE",package="DNA_test")
listoffiles <- list.files(path=JESP)
To access files in the pacakg I use the system.file function. 要访问pacakg中的文件,我使用system.file函数。 But I don't know how to access a directory and read files from it.
但我不知道如何访问目录并从中读取文件。 I use the following statement in the loop to read
我在循环中使用以下语句来阅读
check <- as.matrix(read.csv(file=listoffiles[j],sep=",",header=FALSE))
You should be able to modify this to suit your needs: 您应该能够修改它以满足您的需求:
> packagePath <- find.package("survival", lib.loc=NULL, quiet = TRUE)
> packagePath
[1] "/Library/Frameworks/R.framework/Versions/3.0/Resources/library/survival"
> list.files(packagePath)
[1] "CITATION" "data" "DESCRIPTION" "doc" "help" "html"
[7] "INDEX" "libs" "Meta" "NAMESPACE" "NEWS.Rd" "R"
> list.files(paste0(packagePath, "/data") )
[1] "Rdata.rdb" "Rdata.rds" "Rdata.rdx"
If you need a further look at how system.file
works, just type 如果您需要进一步了解
system.file
工作原理,请输入
system.file
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