Example 4-70 Selecting Columns

The following examples select columns from the IRIS ore.frame object that is created by using the ore.push function on the iris data.frame objects.

IRIS <- ore.push(iris)
# Select the specified column
names(select(IRIS, Petal.Length))
names(select(IRIS, petal_length = Petal.Length))

# Drop the specified column
names(select(IRIS, -Petal.Length))

# rename() keeps all variables
names(rename(IRIS, petal_length = Petal.Length))

Listing for This Example

R> IRIS <- ore.push(iris)
R> # Select the specified column
R> names(select(IRIS, Petal.Length))
[1] "Petal.Length"
R> names(select(IRIS, petal_length = Petal.Length))
[1] "petal_length"
R>
R> # Drop the specified column
R> names(select(IRIS, -Petal.Length))
[1] "Sepal.Length" "Sepal.Width"  "Petal.Width"  "Species" 
R>
R> # rename() keeps all variables
R> names(rename(IRIS, petal_length = Petal.Length))
[1] "Sepal.Length" "Sepal.Width"  "petal_length" "Petal.Width"  "Species"