# A single loop is not enough. A collection of hello world control structures

[This article was first published on

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

**R-posts.com**, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

As the post on “hello world” functions has been quite appreciated by the R community, here follows the second round of functions for wannabe R programmer.

# If else statement: # See the code syntax below for if else statement x=10 if(x>1){ print(“x is greater than 1”) }else{ print(“x is less than 1”) } # See the code below for nested if else statement x=10 if(x>1 & x<7){ print(“x is between 1 and 7”)} else if(x>8 & x< 15){ print(“x is between 8 and 15”) } # For loops: # Below code shows for loop implementation x = c(1,2,3,4,5) for(i in 1:5){ print(x[i]) } # While loop : # Below code shows while loop in R x = 2.987 while(x <= 4.987) { x = x + 0.987 print(c(x,x-2,x-1)) } # Repeat Loop: # The repeat loop is an infinite loop and used in association with a break statement. # Below code shows repeat loop: a = 1 repeat{ print(a) a = a+1 if (a > 4) { break } } # Break statement: # A break statement is used in a loop to stop the iterations and flow the control outside of the loop. #Below code shows break statement: x = 1:10 for (i in x){ if (i == 6){ break } print(i) } # Next statement: # Next statement enables to skip the current iteration of a loop without terminating it. #Below code shows next statement x = 1: 4 for (i in x) { if (i == 2){ next } print(i) } # function words = c(“R”, “datascience”, “machinelearning”,”algorithms”,”AI”) words.names = function(x) { for(name in x){ print(name) } } words.names(words) # Calling the function # extract the elements above the main diagonal of a (square) matrix # example of a correlation matrix cor_matrix <- matrix(c(1, -0.25, 0.89, -0.25, 1, -0.54, 0.89, -0.54, 1), 3,3) rownames(cor_matrix) <- c(“A”,”B”,”C”) colnames(cor_matrix) <- c(“A”,”B”,”C”) cor_matrix rho <- list() name <- colnames(cor_matrix) var1 <- list() var2 <- list() for (i in 1:ncol(cor_matrix)){ for (j in 1:ncol(cor_matrix)){ if (i != j & iAs programming is the best way to learn and think, have fun programming awesome functions!

This post is also shared in R-bloggers and LinkedIn

A single loop is not enough. A collection of hello world control structures was first posted on July 13, 2020 at 5:47 am.

©2020 "R-posts.com". Use of this feed is for personal non-commercial use only. If you are not reading this article in your feed reader, then the site is guilty of copyright infringement. Please contact me at tal.galili@gmail.comToleave a commentfor the author, please follow the link and comment on their blog:R-posts.com.

R-bloggers.com offersdaily e-mail updatesabout R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.