How to convert a 'string numeric' column into pure numeric in R matrix

Question

Giving the following data:

      GOBPID                    Term     col1 col2 col3 col4 col5
1 GO:0001659 temperature_homeostasis 3.496906    0    0    0    0
2          


        

Answer 1

dat is a data.frame, not a matrix. The columns of a data.frame can have different types. In your example, the type of col1-5 is already numeric. Try it yourself:

> dat <- read.table("http://dpaste.com/1486837/plain/",header=TRUE)
> sapply(dat, class)
   GOBPID      Term      col1      col2      col3      col4      col5 
 "factor"  "factor" "numeric" "integer" "integer" "integer" "integer" 
> dat[,3] + 1
[1] 4.496906 4.226069
> dat[,4] + 1
[1] 1 1