elements {dae} | R Documentation |

## Extract the elements of an array specified by the subscripts

### Description

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 `"["`

.

### Usage

`elements(x, subscripts)`

### Arguments

`x` |
An |

`subscripts` |
A two dimensional object interpreted as elements by dimensions. |

### Value

A `vector`

containing the extracted elements and whose length equals the
number of rows in the `subscripts`

object.

### Author(s)

Chris Brien

### See Also

`Extract`

### Examples

```
## 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")])
```

[Package

*dae*version 3.2.28 Index]