Your program needs to take a number as input, and output the number of students who have a grade greater than the given input.

Question

Where is the error? It shows wrong output.

input <- readLines('stdin')
x <- as.integer(input[1])

data <- data.frame(
"id" = c(1:10),
"grade" = c(75, 26, 54, 90, 86, 93, 48, 71, 66, 99)
)
y <- data[data

Answer 1

If you don't want to use subset(), you can also subset by indexing, but mind it must be data[data$grade > x,] (no commas)

To get the number of students, you can use *length()* on a *vector*
Alternatively, you can count the number of rows in the remaining *dataframe* with *nrow(y)*

Answer 2

Ammara Tayyab
Please review subset()

y <- subset(data, grade >x)
print(length(y$grade))

Answer 3

Rik Wittkopp

Thank you. It worked.

Answer 4

Simba

Still shows error.

Answer 5

Ammara Tayyab
Please review before continuing.
R has a steep learning curve, so advisable to be solid on the basics before continuing