# Extract.fv

From spatstat v1.37-0
by Adrian Baddeley

##### Extract Subset of Function Values

Extract a subset of an object of class `"fv"`

.

##### Usage

```
## S3 method for class 'fv':
[(x, i, j, \dots, drop=FALSE)
```

##### Arguments

- x
- a function value object,
of class
`"fv"`

(see`fv.object`

). Essentially a data frame. - i
- any appropriate subset index.
Selects a subset of the rows of the data frame, i.e.
a subset of the domain of the function(s) represented by
`x`

. - j
- any appropriate subset index for the columns of the data frame.
Selects some of the functions present in
`x`

. - ...
- Ignored.
- drop
- Logical. If
`TRUE`

, the result is a data frame or vector containing the selected rows and columns of data. If`FALSE`

(the default), the result is another object of class`"fv"`

.

##### Details

This is a method for `"["`

for the class `"fv"`

.
It is very similar to `[.data.frame`

except for a few extra checks on the sanity of the result.

##### Value

- If
`drop=FALSE`

, a function value object (of class`"fv"`

). If`drop=TRUE`

, a data frame or vector.

##### See Also

##### Examples

```
K <- Kest(cells)
# discard the estimates of K(r) for r > 0.1
Ksub <- K[K$r <= 0.1, ]
# discard the border method estimator
Ksub <- K[ , names(K) != "border"]
# read some values
K[5, ,drop=TRUE]
```

*Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)*

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