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Display the structure in R, we will demonstrate how to use the str() function in R to print the structure of a data object.

We will cover three examples: displaying the structure of a data frame, a list, and a vector.

Example 1: Displaying the Structure of a Data Frame

To begin, we need to create an example data frame in R:

data <- data.frame(x1 = 1:5, x2 = letters[1:5], x3 = factor(c("yes", "no", "yes", "yes", "no")))

Next, we can apply the str() function to this data frame:

str(data)

The output will show the structure of the data frame, including the number of observations, the number of variables, and the type of each variable. For example:

'data.frame':    5 obs. of  3 variables:
 $ x1: int  1 2 3 4 5
 $ x2: chr  "a" "b" "c" "d" ...
 $ x3: Factor w/ 2 levels "no","yes": 2 1 2 2 1

This output shows that our data frame has 5 observations and 3 variables.

The variables x1 and x2 are numeric and character, respectively, while x3 is a factor with two levels.

Example 2: Displaying the Structure of a List

Next, we will create an example list and apply the str() function to it:

my_list <- list(letters[3:1], 555, c(1, 3, 5))

The output will show the structure of the list, including the number of elements and the type of each element. For example:

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List of 3
 $ : chr [1:3] "c" "b" "a"
 $ : num 555
 $ : num [1:3] 1 3 5

This output shows that our list has three elements.

The first element is a character vector, the second element is a numeric value, and the third element is a numeric vector.

Example 3: Displaying the Structure of a Vector

Finally, we will create an example vector and apply the str() function to it:

vec <- c(21, 5, 3, 17, 8, 7, 7, 13)

The output will show the structure of the vector, including its type and length. For example:

 num [1:8] 21 5 3 17 8 7 7 13

This output shows that our vector is numeric and has a length of 8.

Conclusion

In this article, we have demonstrated how to use the str() function in R to print the structure of a data object.

We have covered three examples: displaying the structure of a data frame, a list, and a vector.

By using the str() function, you can quickly and easily evaluate the structure of your data objects in R.

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