# as.interact

##### Extract Interaction Structure

Extracts the interpoint interaction structure from a point pattern model.

##### Usage

```
as.interact(object)
# S3 method for fii
as.interact(object)
# S3 method for interact
as.interact(object)
# S3 method for ppm
as.interact(object)
```

##### Arguments

- object
A fitted point process model (object of class

`"ppm"`

) or an interpoint interaction structure (object of class`"interact"`

).

##### Details

The function `as.interact`

extracts
the interpoint interaction structure from a suitable object.

An object of class `"interact"`

describes an interpoint
interaction structure, before it has been fitted to point pattern
data. The irregular parameters of the interaction (such as the
interaction range) are fixed, but the regular parameters
(such as interaction strength) are undetermined.
Objects of this class are created by the functions
`Poisson`

, `Strauss`

and so on.
The main use of such objects is in a call to `ppm`

.

The function `as.interact`

is generic, with methods for the classes
`"ppm"`

, `"fii"`

and `"interact"`

.
The result is an object of class `"interact"`

which can be printed.

##### Value

An object of class `"interact"`

representing the
interpoint interaction. This object can be printed and plotted.

##### Note on parameters

This function does **not** extract the fitted coefficients
of the interaction. To extract the fitted interaction including
the fitted coefficients, use `fitin`

.

##### See Also

##### Examples

```
# NOT RUN {
data(cells)
model <- ppm(cells, ~1, Strauss(0.07))
f <- as.interact(model)
f
# }
```

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