spam (version 2.11-1)

head: Return the First or Last Part of an Object

Description

Returns the upper left or lower right part of a spam object.

Usage

# S4 method for spam
head(x, n = 6L, m = n, ...)
# S4 method for spam
tail(x, n = 6L, m = n, addrownums = TRUE, ...)

Value

An regular matrix.

Arguments

x

a spam object

n

a single integer. If positive, size for the resulting object: number of elements for a vector (including lists), rows for a matrix or data frame or lines for a function. If negative, all but the n last/first number of elements of x.

m

similar to n but for the number of columns.

addrownums

create row and column namves them from the selected elements.

...

arguments to be passed to or from other methods.

Author

Reinhard Furrer

Details

For matrices, 2-dim tables and data frames, head() (tail()) returns the first (last) n rows and m columns when n > 0 or all but the last (first) n rows when n < 0 (with similar behavior for m).

tail() will add row and column names of the form "[n,]" and "[,n]" to the result, so that it looks similar to the last lines and columns of x when printed. Setting addrownums = FALSE suppresses this behaviour.

A method for spam.chol.NgPeyton objects is exported as well.

Examples

head( precmat.RW2( 10))
tail( precmat.season(n=10, season=3), n=4, m=10)