# Extract.quad

From spatstat v1.55-1
by Adrian Baddeley

##### Subset of Quadrature Scheme

Extract a subset of a quadrature scheme.

##### Usage

```
# S3 method for 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

```
# NOT RUN {
Q <- quadscheme(nztrees)
W <- owin(c(0,148),c(0,95)) # a subwindow
Q[W]
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*

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