elements {dae} | R Documentation |
Elements of the array
x
corresponding to the rows of the two dimensional
object subscripts
are extracted. The number of columns of subscripts
corresponds to the number of dimensions of x
.
The effect of supplying less columns in subscripts
than the
number of dimensions in x
is the same as for "["
.
elements(x, subscripts)
x |
An |
subscripts |
A two dimensional object interpreted as elements by dimensions. |
A vector
containing the extracted elements and whose length equals the
number of rows in the subscripts
object.
Chris Brien
Extract
## Form a table of the means for all combinations of Row and Line.
## Then obtain the values corresponding to the combinations in the data frame x,
## excluding Row 3.
x <- fac.gen(list(Row = 2, Line = 4), each =2)
x$y <- rnorm(16)
RowLine.tab <- tapply(x$y, list(x$Row, x$Line), mean)
xs <- elements(RowLine.tab, subscripts=x[x$"Line" != 3, c("Row", "Line")])