All and any functions

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1 Goal

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The goal of this tutorial is to learn how to simplify our code by using the all and any functions.

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2 The use of length + which

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# Let's use the iris dataset
data(iris)

# We want to know if there is any value of Petal.Length bigger than 6
if(length(which(iris$Petal.Length > 6)) > 0) print("There is")

## [1] "There is"

# We will check now if there are entries of the versicolor family
if(length(which(iris$Species == "versicolor"))) print("Versicolour")

## [1] "Versicolour"

# Now we want to know if all the plants in iris are versicolor
if(length(which(iris$Species == "versicolor")) == nrow(iris)){ 
  
  print("All versicolor")
  
}else{
  
  print("You have more plants")
}

## [1] "You have more plants"

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3 Improving code readibility with the use of any and all

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# Let's redo the queries above using all and any

# We want to know if there is any value of Petal.Length bigger than 6
if(any(iris$Petal.Length > 6)) print("There is")

## [1] "There is"

# We will check now if there are entries of the versicolor family
if(any(iris$Species == "versicolor")) print("Versicolour")

## [1] "Versicolour"

# Now we want to know if all the plants in iris are versicolor
if(all(iris$Species == "versicolor")){ 
  
  print("All versicolor")
  
}else{
  
  print("You have more plants")
}

## [1] "You have more plants"

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4 Conclusion

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In this tutorial we have learnt how to make our code more simple and readable using the all and any functions