# transect.im

From spatstat v1.31-2
by Adrian Baddeley

##### Pixel Values Along a Transect

Extract the pixel values of a pixel image at each point along a linear transect.

##### Usage

```
transect.im(X, ..., from="bottomleft", to="topright",
click=FALSE, add=FALSE)
```

##### Arguments

- X
- A pixel image (object of class
`"im"`

). - ...
- Ignored.
- from,to
- Optional. Start point and end point of the transect.
Pairs of $(x,y)$ coordinates
in a format acceptable to
`xy.coords`

, or keywords`"bottom"`

,`"left"`

,`"top"`

- click
- Optional.
Logical value.
If
`TRUE`

, the linear transect is determined interactively by the user, who clicks two points on the current plot. - add
- Logical. If
`click=TRUE`

, this argument determines whether to perform interactive tasks on the current plot (`add=TRUE`

) or to start by plotting`X`

(`add=FALSE`

).

##### Details

The pixel values of the image `X`

along a line segment
will be extracted. The result is a function table (`"fv"`

object)
which can be plotted directly.

If `click=TRUE`

, then the user is prompted to click two points on
the plot of `X`

. These endpoints define the transect.

Otherwise, the transect is defined by the endpoints
`from`

and `to`

. The default is a diagonal transect from
bottom left to top right of the frame.

##### Value

- An object of class
`"fv"`

which can be plotted.

##### See Also

##### Examples

```
Z <- density(redwood)
plot(transect.im(Z))
plot(transect.im(Z, click=TRUE))
```

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

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