
Extract or replace a subset of a hyperframe.
# S3 method for hyperframe
[(x, i, j, drop, strip=drop, …)
# S3 method for hyperframe
[(x, i, j) <- value
# S3 method for hyperframe
$(x, name)
# S3 method for hyperframe
$(x, name) <- value
A hyperframe (object of class "hyperframe"
).
Row and column indices.
Logical values indicating what to do when the hyperframe has only one row or column. See Details.
Ignored.
Name of a column of the hyperframe.
Replacement value for the subset. A hyperframe or (if the subset is a single column) a list or an atomic vector.
A hyperframe (of class "hyperframe"
).
These functions extract a designated subset of a hyperframe, or replace the designated subset with another hyperframe.
The function [.hyperframe
is a method for the subset operator
[
for the
class "hyperframe"
. It extracts the subset of x
specified by the row index i
and column index j
.
The argument drop
determines whether the array structure
will be discarded if possible. The argument strip
determines
whether the list structure in a row or column or cell will be discarded if
possible.
If drop=FALSE
(the default), the return value is always
a hyperframe or data frame.
If drop=TRUE
, and if the selected subset has only one row,
or only one column, or both, then
if strip=FALSE
, the result is a
list, with one entry for each array cell that was selected.
if strip=TRUE
,
if the subset has one row containing several columns, the result is a list or (if possible) an atomic vector;
if the subset has one column containing several rows, the result is a list or (if possible) an atomic vector;
if the subset has exactly one row and exactly one column, the result is the object (or atomic value) contained in this row and column.
The function [<-.hyperframe
is a method for the
subset replacement operator [<-
for the
class "hyperframe"
. It replaces the designated
subset with the hyperframe value
.
The subset of x
to be replaced is designated by
the arguments i
and j
as above.
The replacement value
should be a hyperframe with the
appropriate dimensions, or (if the specified subset is a single
column) a list of the appropriate length.
The function $.hyperframe
is a method for $
for hyperframes. It extracts the relevant column of the hyperframe.
The result is always a list (i.e. equivalent to using
[.hyperframe
with strip=FALSE
).
The function $<-.hyperframe
is a method for $<-
for hyperframes. It replaces the relevant column of the hyperframe.
The replacement value should be a list of the appropriate length.
# NOT RUN {
h <- hyperframe(X=list(square(1), square(2)), Y=list(sin, cos))
h
h[1, ]
h[1, ,drop=TRUE]
h[ , 1]
h[ , 1, drop=TRUE]
h[1,1]
h[1,1,drop=TRUE]
h[1,1,drop=TRUE,strip=FALSE]
h[1,1] <- list(square(3))
# extract column
h$X
# replace existing column
h$Y <- list(cells, cells)
# add new column
h$Z <- list(cells, cells)
# }
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