attr {base}R Documentation

Object Attributes


Get or set specific attributes of an object.


attr(x, which)
attr(x, which) <- value


x an object whose attributes are to be accessed.
which a character string specifying which attribute is to be accessed.
value an object, the new value of the attribute.


This function provides access to a single object attribute. The simple form above returns the value of the named attribute. The assignment form causes the named attribute to take the value on the right of the assignment symbol.
The first form first looks for an exact match to code amongst the attributed of x, then a partial match. If no exact match is found and more than one partial match is found, the result is NULL.


Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also



# create a 2 by 5 matrix
x <- 1:10
attr(x,"dim") <- c(2, 5)

[Package base version 2.1.0 Index]