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Week 7 Feb 15.pdf - Week 7 Feb 15 Tuesday 1:33 PM...

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> x <- 123 # Set x to a plain number > x [1] 123 > attr(x,"fred") <- "abc" # Add a "fred" attribute to x > x [1] 123 attr(,"fred") [1] "abc" Shows up whenever used in computation and travels with var Easy way of attaching information to a variable dim = matrix marker names = names of elements in list or vector dimnames = names of rows/columns Automatically included in matrices and lists unclass gets rid of class atribute, so it the var is handled normally class attribute tells R that objects in the class should be printed differently Attributes Datacamp info matrix's names transfer to DF as.data.frame creates DF from list (adding data.frame attr) or matrix (splitting into columns) if header=TRUE argument is given, first line of source is used to name variables
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