Write a R Program to get following tasks done

@ayush370 wrote:

Write a 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

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