The function sum is a widely used function to sum up the values in a vector, data.frame. An argument na.rm is used to ignore NA values when the vector has NA values.
The basic usage of sum() function is written in the exercise.
# Generate a vector from 1 to 10
x <- seq(1, 10)
# Sum up the values in variable x
sum(x)
# Generate a vector that includes NA value
y <- c(seq(1,5), NA, seq(6,10))
# print y
y
# Fix the following code by using na.rm argument to remove NA when calculating sum.
z <- sum(y)
z
# Generate a vector from 1 to 10
x <- seq(1, 10)
# Sum up the values in variable x
sum(x)
# Generate a vector that includes NA value
y <- c(seq(1,5), NA, seq(6,10))
# print y
y
# Fix the following code by using na.rm argument to remove NA when calculating sum.
z <- sum(y, na.rm=TRUE)
z
msg <- "Please see that objects are well-defined and correct."
test_object("x", undefined_msg = msg, incorrect_msg = msg)
test_object("y", undefined_msg = msg, incorrect_msg = msg)
test_object("z", undefined_msg = msg, incorrect_msg = msg)
success_msg("Great! Head over to the next exercise.")