Replacing occurrences of a number in multiple columns of data frame with another value in R

Question

ETA: the point of the below, by the way, is to not have to iterate through my entire set of column vectors, just in case that was a proposed solution (just

Answer 1

Basically data[, 2:3]==4 gave you the index for data[,2:3] instead of data:

R > data[, 2:3] ==4
       var1  var2
 [1,] FALSE FALSE
 [2,] FALSE FALSE
 [3,] FALSE FALSE
 [4,]  TRUE  TRUE
 [5,] FALSE  TRUE
 [6,] FALSE  TRUE
 [7,] FALSE FALSE
 [8,] FALSE FALSE
 [9,] FALSE FALSE

So you may try this:

R > data[,2:3][data[, 2:3] ==4]
[1] 4 4 4 4