CODEWITHSUNDEEP
rattributesstructure
melatonin15
melatonin15

Reputation: 2279

structure and attribute in R

I am going over the book Advanced R by Hadley. The book has a question which makes me really confused:

> structure(1:6, comment = "my attribute")
[1] 1 2 3 4 5 6

When you print that object you don't see the comment attribute. Why? Is the attribute missing, or is there something else special about it?

Could anyone help me understand what's going on here?

Upvotes: 7

Views: 842

Answers (1)

Josh O'Brien
Josh O'Brien

Reputation: 162401

An attribute named "comment" is treated specially by R's default print method. From ?comment:

Description:

     These functions set and query a _comment_ attribute for any R
     objects.  This is typically useful for ‘data.frame’s or model
     fits.

     Contrary to other ‘attributes’, the ‘comment’ is not printed (by
     ‘print’ or ‘print.default’).

Upvotes: 10

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