The function that creates vectors by concatenation.

There are  ___ number of functions that exists for data wrangling using dplyr.

Which of the following tests each element of x for membership in y?

The empirical cumulative distribution function can be called as __________ 

The dplyr package is used to speed up data frame management code.

Categorical variables that can hold either string or numeric values. 

 To get the current date, the _______ function will return a Date object which can be converted to a different class if necessary. 

Pick the output of the following.

 

> printmessage <- function(x) {
+ if(x > 0)
+         print("x is greater than zero")
+ else
+         print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)

What are the data type and storage mode of the variable x in the following R syntax?

x <- 1:3

Which of the following statements about functions in R is correct?