How to read a data frame as factors?

Question

I have a data frame stored in a file that looks like this:

             V1          V2      ...... V100
V1           0            1              0
V2           0            0              1
.
.
.
V1000

As you can see, the values in the dataframe can be only "0" or "1". When I do

myData<-read.table("data.txt")

R considers the columns to be of class "integers". I would like to modify the class of all my columns to become of class "factor". Is there an easy to do it?

Answer 1

我会建议：

df[] <- lapply(df, factor)

Answer 2

如乔兰建议，您可以使用

myData<-read.table("data.txt", colClasses="factor")