11.2 On data frames or matrices

• Read in a file into a data frame with the read.table function:

a <- read.table(file="file.txt")

You can convert it as a matrix, if needed, with:

a <- as.matrix(read.table(file="file.txt"))

Useful arguments:

• Write a data frame or matrix to a file:

write.table(x=a,
    file="file.txt")

Useful arguments:

• Note that " stands for tab-delimitation