The length() function is used to find the length of list,vector or data frame.

The following method shows how you can do it with syntax.

Method: Use length() Function

length(x)


The following examples show how to use length() function in R.

## Use length() Function to Find Length of Vector

Suppose we want to find length of vector using length() function:

# Define vector
vector1 <-c(45,85,89,78,12,36,68,32,12)

# Find length
len <- length(vector1)

# Show length
print(len)


Output:

[1] 9


As we can see in output the length of vector vector1 is 9.

## Use length() Function to Find Length of Data Frame

Let’s see how we can calculate length data frame using length() function:

# Create data frame
df <- data.frame(Machine_name=c("A","B","C","D","E","F"),
Pressure=c(78.2, 71.7, 80.21, 83.12, 82.56, 79.50),
Temperature=c(31, 35, 36, 36, 38, 32),
Status=c(TRUE,TRUE,FALSE,FALSE,FALSE,TRUE))

# Get length of data frame
l <-length(df)

# Print length
print(l)


Output:

[1] 4


As output we can see length() function returns the number of columns which is 4.

The length() function count the elements from vector,list or data frame and return the total.