Random Questions & Answers on R || Article

Hello Friends, Welcome to the second article of series named Random Questions & Answers on R. The main motto of this series of articles is to provide Questions and their Answers related to R-software that you must know if you are a student of Statistics and want to work or already working on R. These articles will also help you if you are preparing for any corporate sector interview where R is mandatory. So, without wasting the time, Just dive into this article and learn the following 10 Qusetions from here 😊

Q.1. How to create a bar diagram in R using base package ?

Ans : A bar diagram is created in R by using barplot ( ) function.

Q.2. How to create a boxplot in R using base package?

Ans : A boxplot is created in R by using boxplot ( ) function.

Q.3. How to perform addition of two matrices in R ?

Ans : Matrix addition is performed in R by using + operator.

Q.4. What will be the output of R code : print(eval(2 + 3));

Ans : 5

Q.5. How to convert a matrix object into dataframe ?

Ans : A matrix object is converted into dataframe in R by using as.data.frame ( ) function.

Q.6. What is the purpose of using ggplot2 package in R ?

Ans : ggplot2 is used for data visualization in R.

Q.7. How to calculate median of numeric vector x = c(2, 5, 1, 6, 7) ?

Ans : Median of a numeric vector is calculated in R by using median ( ) function.

Q.8. How to calculate median of numeric vector x = c(2, 5, 1, 6, 7, NA) ?

Ans : Median of a numeric vector in presence of missing values is calculated in R by using median ( ) function and also pass one more argument na.rm and set its value as TRUE .

Q.9. What will be the output of following R code : x = c(1, 2, NA, 3, 8, 2, 4, 7) ; median(x)

Ans : NA

Q.10. Suppose you have a dataframe in R with 1000 rows and 15 columns. How will you access element of 100th row and 3rd column ?

Ans : If a is dataframe object in R, Element of 100th row and 3rd column of a is accessed by a[100,3]

So, That's all about 10 questions on R in this article. In next article we'll learn 10 more questions on R-Software. Till then, Good Bye !

Happy Learning ! 😊

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