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 all() and any()
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Description

The all() and any() functions come with R and are part of the Base R {base} package.

We use these functions to ask if all values in a given array meet some logical condition (all()), or if any values in a given array meet some logical condition (any()). In other words…

• The function all() asks: “Is this thing TRUE for all of the array values?”
• The function any() asks: “Is this thing TRUE for any (at least one) of the array values?”

Conceptual Usage

all(logical statement about an array)

any(logical statement about an array)

Examples

# Is it TRUE that ALL of the values in this array are greater than 5?
my_array <- c(6, 77, 8, 22)
all(my_array > 5)

## [1] TRUE

# Is it TRUE that ANY of the values in this array are greater than 5?
my_array <- c(4, 5, 7, 8, 22)
any(my_array > 5)

## [1] TRUE

# Is it TRUE that ALL of the strings in this array have 3 characters?
my_array <- c("one", "two", "three")
all( nchar(my_array) == 3 )

## [1] FALSE

# Is it TRUE that ANY of the strings in this array have 3 characters?
my_array <- c("one", "two", "three")
any( nchar(my_array) == 3 )

## [1] TRUE