[英]R write file with names of the objects
考慮一下:
我有帶有對象名稱的矢量fav.activities
:
fav.activities <- c("swiming", "basketball", "baseball", "football")
names(fav.activities) <- c("Tom", "Ben", "Paul", "Ann")
我現在要保存整個文件。 用過的
write(fav.activities)
但是不會保存對象的名稱。 我應該怎么做?
write()
使用cat()
並在將輸出發送到屏幕/文件時刪除"names"
屬性:
R> cat(fav.activities)
swiming basketball baseball footballR>
如果要將向量讀出到文本/定界文件,則一種方法是強制轉換為矩陣並使用write.table()
:
R> write.table(t(as.matrix(fav.activities)), "foo.txt", row.names = FALSE)
R> readLines("foo.txt")
[1] "\"Tom\" \"Ben\" \"Paul\" \"Ann\""
[2] "\"swiming\" \"basketball\" \"baseball\" \"football\""
額外的\\"
就是R將字符串打印到控制台的方式。在我的OS中,文件如下所示:
$ cat foo.txt
"Tom" "Ben" "Paul" "Ann"
"swiming" "basketball" "baseball" "football"
即它是一個用空格分隔的文件。 可以定義其他分隔符。 參見?write.table
。
如果您只想讀取向量以便在以后的R會話中使用,則save()
或saveRDS()
是兩個選項:
ls()
save(fav.activities, file = "obj.rda")
rm(list = ls())
load("obj.rda")
ls()
saveRDS(fav.activities, file = "obj2.rds")
new.fav <- readRDS("obj2.rds")
ls()
all.equal(fav.activities, new.fav)
輸出如下:
R> ls()
[1] "fav.activities"
R> save(fav.activities, file = "obj.rda")
R> rm(list = ls())
R> load("obj.rda")
R> ls()
[1] "fav.activities"
R> saveRDS(fav.activities, file = "obj2.rds")
R> new.fav <- readRDS("obj2.rds")
R> ls()
[1] "fav.activities" "new.fav"
R> all.equal(fav.activities, new.fav)
[1] TRUE
save()
和saveRDS()
之間的主要區別在於,前者保存對象及其名稱,因此只能使用相同的對象名稱進行還原。 而saveRDS()
只是序列化對象,然后在將序列化的對象加載到R會話時必須將其分配給對象。
如果要以文本格式保存數據,請使用:
write.table(fav.activities, file = "filename.txt", col.names = FALSE)
要從文本文件還原對象:
dat <- read.table("filename.txt", stringsAsFactors = FALSE)
fav.activities <- structure(dat[ , 2], .Names = dat[ , 1])
如果要保存R對象的表示形式,請使用:
save(fav.activities, file = "filename.RData")
還原對象:
load("filename.RData")
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