nr | R Documentation |
nr()
and nc()
are synonyms of the ugly NROW()
or NCOL()
that get the number of row and columns in a matrix or data frame, but also in
a vector (they return a value even if the dim
attribute of the object is
not set, on the contrary to nrow()
or ncol()
).
ROWS
and COLS
are constants that makes call to apply()
more expressive.
ROWS = 1L
and COLS = 2L
.
nr(x)
nc(x)
ROWS
COLS
x |
Any object. |
An object of class integer
of length 1.
An object of class integer
of length 1.
nrow()
mm <- matrix(1:6, nrow = 3)
nr(mm)
nc(mm)
vv <- 1:6
nr(vv)
nc(vv)
# ROWS and COLS constants used with apply()
apply(mm, ROWS, mean) # Idem apply(mm, 1, mean)
apply(mm, COLS, mean) # Idem apply(mm, 2, mean)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.