read.table reads “T” as TRUE and “F” as FALSE, how to avoid?

Question

I have a file with the data c(\"A\",\"T\",\"B\",\"F\").

When I use:

read.csv(myfile,header=F,stringsAsFactors=F)

R in

Answer 1

I came across to similar problem here is the solution:

#dummy data
df <- read.csv(text="
A,B,T,T,F
T,T,F,T,text1
A,T,NA,F,T",
               header=FALSE, stringsAsFactors=FALSE)
#data
df
#   V1 V2    V3    V4    V5
# 1  A  B  TRUE  TRUE     F
# 2  T  T FALSE  TRUE text1
# 3  A  T    NA FALSE     T

#convert logical columns to single letters
df[,sapply(df,class) == "logical"] <-
  sapply(df[,sapply(df,class) == "logical"],
         function(i) substr(as.character(i),1,1))

#result
df
#   V1 V2   V3 V4    V5
# 1  A  B    T  T     F
# 2  T  T    F  T text1
# 3  A  T   F     T