Reference no: EM132588351

R Programming Assignment -

1. Write R Program to get following tasks done:

a. Get the Number of Words and Number of Characters from any string i.e., New Delhi - has 2 words and 9 characters

b. Write the function(n) to get the exponential value 5^n

c. Remove all numeric digits and special chars from any string i.e., xyz21abc30.com

d. Extract only Numeric value from any string i.e., ab50af: 50

e. Write a function which read xlsx file and write csv format of that file in current working directory

f. Print difference of seconds from two date times

g. Create a function to distinguish every character whether it is alphabet, number or a special character from a given list

Eg. c(a,1,@) : a - character, 1- number, @- spl character

h. Create a xlsx workbook, add a sheet with name "test" and save it in Current Working Directory

i. Write a command in R to delete only the .xlsx files present in the current working directory

j. Write a function to count the occurrence of words in a given list starting with Vowels ignoring case.

Eg. c(apple, cat, apple, egg, dog, Apple ,Egg)

Result : apple - 3, egg - 2

k. Find Mean and Variance of dataset using only sqldf package of R

Eg. Mean of c(1, 2, 4, 5, 7, 11) is 5 and variance is 11

2. What do you understand by term Mean/ Mode/ Median/ Standard Deviation?

3. Why you want to data science as your career.