Control Structures in R Programming MCQ question and answer with solution

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Each section contains 100 MCQs on Control Structures in R Programming .

R Commander is used to . . . . . . . . in R.

A) Export data B) Import data C) Use data D) Work on data

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

R has . . . . . . . . basic indexing operators.

A) two B) three C) four D) five

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which of the following code skips the first 20 iterations?

for(i in 1:100) {
             if(i <= 20) {
                next
      }
}

for(i in 1:100) {
           if(i <= 19) {
           next
       }
}

for(i in 1:100) {
         if(i <= 21) {
         next
      }
}

for(i in 1:10) {
         if(i <= 24) {
         next
      }
}

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

If the function in a console is.matrix(X) returns true then X can be considered as a . . . . . . . .

A) Matrix object B) Matrix data object C) Matrix vector D) Vector

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

How is a Data object represented internally in R language?

A) unclass (as.time ("2018-12-28")) B) unclass (as.dat ("2018-12-28")) C) unclass (as.D (2018-12-28)) D) unclass (as.Date ("2018-12-28"))

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement?

A) for will execute a loop a fixed number of times B) break will execute a loop while a condition is true C) if and else tests a condition and acting on it D) break is used to break the execution of a loop

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement?

A) A formal argument can be a symbol, a statement of the form 'symbol = expression', or the special formal argument B) The first component of the function declaration is the keyword function C) The value returned by the call to function is not a function D) Functions are also often written when code must be shared with others or the public

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement?

A) Blocks are evaluated until a new line is entered after the closing brace B) Single statements are evaluated when a new line is typed at the start of the syntactically complete statement C) The if/else statement conditionally evaluates two statements D) Break will execute a loop while a condition is true

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

. . . . . . . . function can be used to add datasets in R provided with the columns in the datasets should be the same.

A) rbind() B) bbind() C) jbind() D) hbind()

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

If the programmers want the output to be a data frame or a vector, then . . . . . . . . function is used.

A) Lapply B) Sapply C) Vapply D) Zapply

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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Control Structures in R Programming MCQ question and answer with solution | R Programming MCQs