读入纯文本型数据框
Use the read.table function, which returns a data frame:
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> dfrm <- read.table("filename.txt")To prevent read.table from interpreting character strings as factors, set the stringsAs
Factors parameter to FALSE:
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> dfrm <- read.table("statisticians.txt", stringsAsFactor=FALSE)
> class(dfrm$V1)
[1] "character"
If any field contains the string “NA”, then read.table assumes that the value is missing
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and converts it to NA. Your datafile might employ a different string to signal missing
values; if it does, use the na.strings parameter. The SAS convention, for example, is 公卫家园
that missing values are signaled by a single period (.). We can read such datafiles like
this:
> dfrm <- read.table("filename.txt", na.strings=".")
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