array2df {hyperSpec} | R Documentation |
The "wide-format" array is converted into a "long-format" matrix
or data.frame
.
array2df(x, levels = rep(NA, length(dims)), matrix = FALSE, label.x = deparse(substitute(x)))
x |
array |
levels |
list with the levels for the dimensions of x .
If levels[[i]] is NULL no column is produced for this
factor.
If levels[[i]] is NA , the result column is a numeric
with range from 1 to dim (x)[i]
names(levels) yield the resulting column names.
|
matrix |
If TRUE , a numeric matrix rather than a data.frame
is returned.
|
label.x |
Name for the column containing the x values. |
If the resulting data.frame
is too large to fit in memory, a
matrix
might help.
The main benefit of this function is that it uses matrices as long as possible. This can give large advantages in terms of memory consumption.
A data.frame
or matrix
with prod (dim (x))
rows
and length (dim (x)) + 1
columns.
C. Beleites
arr <- array (rnorm (24), 2:4) array2df (arr) array2df (arr, levels = list(NULL, x = NA, c = NULL), label.x = "value") array2df (arr, levels = list(NULL, x = NA, c = letters [1:4]), label.x = "value") summary (array2df (arr, levels = list(NULL, x = NA, c = letters [1:4]), label.x = "value")) summary (array2df (arr, levels = list(NULL, x = NA, c = letters [1:4]), label.x = "value", matrix = TRUE))