gs gs110 History, Overview - Overview of R - Quiz No.3
gs gs110 R Language Quiz
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Question 1: What is the class defined in the following R code?
y<-c(FALSE,2)
Character
Numeric
Logical
Integer
Question 2: Which one of the following is not a basic datatype?
Numeric
Character
Data frame
Integer
Question 4: What will be the output of the following R code?
x<- c (“a”,” b”) as.numeric(x)
[1] 1 2
[1] TRUE TRUE
[1] NA NA (Warning message: NAs introduced by coercion)
[1] NAN
Question 6: How could be the matrix constructed by using the following R code?
m <- matrix(1:6, nrow = 2, ncol = 3)
row-wise
column-wise
any manner
data insufficient
Question 7: Matrices can be created by row-binding with the help of the following function.
rjoin()
rbind()
rowbind()
rbinding()
Question 8: What is the function used to test objects (returns a logical operator) if they are NA?
is.na()
is.nan()
as.na()
as.nan()
Question 9: What is the function used to test objects (returns a logical operator) if they are NaN?
as.nan()
is.na()
as.na()
is.nan()
Question 10: What is the function to set column names for a matrix?
names()
colnames()
col.names()
column name cannot be set for a matrix
