# envelope.envelope

##### Recompute Envelopes

Given a simulation envelope (object of class `"envelope"`

),
compute another envelope from the same simulation data
using different parameters.

##### Usage

```
## S3 method for class 'envelope':
envelope(Y, fun = NULL, ...,
transform=NULL, global=FALSE, VARIANCE=FALSE)
```

##### Arguments

- Y
- A simulation envelope (object of class
`"envelope"`

). - fun
- Optional. Summary function to be applied to the simulated point patterns.
- ...,transform,global,VARIANCE
- Parameters controlling the type of envelope that is re-computed.
See
`envelope`

.

##### Details

This function can be used to re-compute a simulation envelope from previously simulated data, using different parameter settings for the envelope: for example, a different significance level, or a global envelope instead of a pointwise envelope.

The function `envelope`

is generic. This is the method for
the class `"envelope"`

.
The argument `Y`

should be a simulation envelope (object of
class `"envelope"`

) produced by any of the methods for
`envelope`

. Additionally, `Y`

must contain either

- the simulated point patterns that were used to create
the original envelope (so
`Y`

should have been created by calling`envelope`

with`savepatterns=TRUE`

); - the summary functions of the simulated point patterns
that were used to create
the original envelope (so
`Y`

should have been created by calling`envelope`

with`savefuns=TRUE`

).

If the argument `fun`

is given, it should be a summary function
that can be applied to the simulated point patterns that were
used to create `Y`

. The envelope of
the summary function `fun`

for these point patterns
will be computed using the parameters specified in `...`

.

If `fun`

is not given, then:

- If
`Y`

contains the summary functions that were used to compute the original envelope, then the new envelope will be computed from these original summary functions. - Otherwise, if
`Y`

contains the simulated point patterns. then the$K$function`Kest`

will be applied to each of these simulated point patterns, and the new envelope will be based on the$K$functions.

`...`

. See `envelope`

for a full list of envelope parameters.
Frequently-used parameters include `nrank`

and `nsim`

(to change the
number of simulations used and the significance level of the
envelope), `global`

(to change from pointwise to global
envelopes) and `VARIANCE`

(to compute the envelopes from the sample
moments instead of the ranks).

##### Value

- An envelope (object of class
`"envelope"`

.

##### See Also

##### Examples

```
data(cells)
E <- envelope(cells, Kest, nsim=19, savefuns=TRUE, savepatterns=TRUE)
E2 <- envelope(E, nrank=2)
Eg <- envelope(E, global=TRUE)
EG <- envelope(E, Gest)
EL <- envelope(E, transform=expression(sqrt(./pi)))
```

*Documentation reproduced from package spatstat, version 1.31-2, License: GPL (>= 2)*