Loop with Multiple Conditions in R (2 Examples) | while- & for-Loops

 

In this tutorial, I’ll show how to write and run loops with multiple conditions in the R programming language.

Table of contents:

Let’s dig in:

 

Example 1: Writing Loop with Multiple for-Statements

In Example 1, I’ll show how to write a for-loop containing multiple for-statements:

for(i in 1:5) {                           # Head of first for-loop
 
  for(j in 1:3) {                         # Head of second for-loop
 
    print(paste("i =", i, "; j =", j))    # Some output
  }
}
# [1] "i = 1 ; j = 1"
# [1] "i = 1 ; j = 2"
# [1] "i = 1 ; j = 3"
# [1] "i = 2 ; j = 1"
# [1] "i = 2 ; j = 2"
# [1] "i = 2 ; j = 3"
# [1] "i = 3 ; j = 1"
# [1] "i = 3 ; j = 2"
# [1] "i = 3 ; j = 3"
# [1] "i = 4 ; j = 1"
# [1] "i = 4 ; j = 2"
# [1] "i = 4 ; j = 3"
# [1] "i = 5 ; j = 1"
# [1] "i = 5 ; j = 2"
# [1] "i = 5 ; j = 3"

Note that these kinds of loops are also called nested loops. You can learn more about that in this R programming tutorial.

 

Example 2: Writing Loop with Multiple if-Conditions

It is also possible to include several if (or else) conditions inside of a loop. Have a look at the following example code:

for(i in 1:5) {                           # Head of for-loop
 
  if(i < 4) {                             # First if-condition
 
    if(i %in% seq(2, 10, 2)) {            # Second if-condition
 
      print(i)                            # Some output
    }
  }
}
# [1] 2

In the previous R code we nested two if-conditions. However, we may also specify multiple logical conditions within a single if-statement:

for(i in 1:5) {                           # Head of for-loop
 
  if(i < 4 & i %in% seq(2, 10, 2)) {      # Combine two if-conditions
 
    print(i)                              # Some output
  }
}
# [1] 2

The output is the same.

Note that we could apply the same logic within other types of loops such as repeat-loops or while-loops.

 

Video, Further Resources & Summary

Would you like to know more about loops? Then you may watch the following video of my YouTube channel. I’m explaining the R programming code of this article in the video.

 

The YouTube video will be added soon.

 

Additionally, you might read the other tutorials of my website. I have published numerous articles about different types of loops already:

 

On this page, I illustrated how to write loops with multiple conditions in R programming. If you have additional questions, don’t hesitate to let me know in the comments below. Furthermore, please subscribe to my email newsletter to receive regular updates on the newest articles.

 

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