# Extract.quad

From spatstat v1.17-2
by Adrian Baddeley

##### Subset of Quadrature Scheme

Extract a subset of a quadrature scheme.

##### Usage

```
## S3 method for class 'quad':
[(x, ...)
```

##### Arguments

- x
- A quadrature scheme (object of class
`"quad"`

). - ...
- Arguments passed to
`[.ppp`

to determine the subset.

##### Details

This function extracts a designated subset of a quadrature scheme.

The function `[.quad`

is a method for `[`

for the
class `"quad"`

. It extracts a designated subset of a quadrature
scheme.

The subset to be extracted is determined by the arguments `...`

which
are interpreted by `[.ppp`

. Thus it is possible to take the
subset consisting of all quadrature points that lie inside a
given region, or a subset of quadrature points identified by
numeric indices.

##### Value

- A quadrature scheme (object of class
`"quad"`

).

##### See Also

##### Examples

```
data(nztrees)
Q <- quadscheme(nztrees)
W <- owin(c(0,148),c(0,95)) # a subwindow
Q[W]
```

*Documentation reproduced from package spatstat, version 1.17-2, License: GPL (>= 2)*

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