remove column in matrix r code example

Example 1: how to drop a column in r

keeps <- c("y", "a")
DF[keeps]

Example 2: remove column from matrix r

# Remove third column - by column number
MyMatrix <- MyMatrix[,-3]

# Remove third and fifth columns - by feeding the matrix a boolean vector
MyMatrix <- MyMatrix[,c(TRUE,TRUE,FALSE,TRUE,FALSE,TRUE)]