Question Bank in R – PROGRAMMING By RVS UNIT-1

Question Bank in R – PROGRAMMING By RVS

UNIT-1

           1.           List the data structures in R with examples.
2.       Write syntax of if else in R.
3.       Write any 3 math functions in R.
4.       Explain Datatypes in R
5.       List the differences between vector and list.
6.       Calculate the cummulative sum and cummulative product for the given data 23, 1, 7, -2, 8,
7.       10, 17
8.       Explain in detail about dataframe and arrays with example R code.
9.       Write R code to generate first n terms of a Fibonacci series
10.   Create a 3-dimensional array in R.
11.   Find the minimum and maximum for 14, 23, 16, 20, 0, -17, 100
12.   Create a simple matrix with 3X3 size in R.
13.   Find the factorial of 6. Find the mean, median, standard deviation of
14.   2,4,9,10,14,28,52.
15.   Explain dnorm() function
16.   What is a vector in R? Explain operations on vectors.
17.   Write R function to check whether the given number is prime or not
18.   Explain the functioning of lapply() and tapply() in a R program with one example
19.   What is variable scope?
20.   Distinguish between max( ) and pmax( ) functions.

221.   R pmax Function

pmax() function returns the parallel maxima vector of multiple vectors or matrix.

pmax(..., na.rm = FALSE)

...: Numeric or character arguments

na.rm: whether missing values should be removed

> x <- c(3, 26, 122, 6)

> y <- c(43,2,54,8)

> z <- c(9,32,1,9)

> pmax(x,y,z)

[1]  43  32 122   9

222.   Explain about quote( ) function.

23.   Justify the following: “R functions are first-class objects”.