head {spam} | R Documentation |
Returns the upper left or lower right part of a
spam
object.
head(x, ...) tail(x, ...) # head.spam(x, n = 6L, m = n, \dots) # tail.spam(x, n = 6L, m = n, addrownums = TRUE, \dots)
x |
a |
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 |
m |
similar to |
addrownums |
create row and column namves them from the selected elements. |
... |
arguments to be passed to or from other methods. |
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.
An regular matrix.
Reinhard Furrer
head( precmat.RW2( 10)) tail( precmat.season(n=10, season=3), n=4, m=10)