How to Select Specific Columns from a Data Frame in R
Which expression is correct to select the 3rd and 5th columns from a data frame called bats?
A. bats[c,(3,5)]
B. bats(c{3,5})
C. bats-x-c(3,5)
D. bats[c(3,5)]
Final answer:
The correct expression to select the 3rd and 5th columns from a data frame called bats in R is D. bats[c(3,5)].
To select the 3rd and 5th columns from a data frame called bats in R, the correct expression would be D. bats[c(3,5)]. This syntax uses the c() function to combine the column indices 3 and 5 into a vector, which is then used to subset the data frame bats for those specific columns.
Here's a step-by-step example:
- Assume you have a data frame named bats which contains several columns.
- To select the 3rd and 5th columns only, use the expression bats[, c(3, 5)]. Note the comma before the c() function which indicates you are selecting columns.
- The result will be a new data frame with only columns 3 and 5 from the original bats data frame.