# marks.tess

##### Marks of a Tessellation

Extract or change the marks attached to the tiles of a tessellation.

##### Usage

```
# S3 method for tess
marks(x, …)
```# S3 method for tess
marks(x, …) <- value

# S3 method for tess
unmark(X)

# S3 method for lintess
marks(x, …)

# S3 method for lintess
marks(x, …) <- value

# S3 method for lintess
unmark(X)

##### Arguments

- x,X
Tessellation (object of class

`"tess"`

) or tessellation on a linear network (object of class`"lintess"`

).- …
Ignored.

- value
Vector or data frame of mark values, or

`NULL`

.

##### Details

These functions extract or change the marks
attached to each of the tiles in the tessellation `x`

.
They are methods for the generic functions
`marks`

and `marks<-`

for the class `"tess"`

of tessellations
and the class `"lintess"`

of tessellations on a network.

The expression `marks(x)`

extracts the marks of `x`

.
The assignment `marks(x) <- value`

assigns new marks to the
dataset `x`

, and updates the dataset `x`

in the current
environment.

The marks can be a vector, a factor, or a data frame.

For the assignment `marks(x) <- value`

, the `value`

should be a vector or factor of length equal to the number of
tiles in `x`

, or a data frame with as many rows
as there are tiles in `x`

. If `value`

is a single value,
or a data frame with one row, then it will be replicated
so that the same marks will be attached to each tile.

To remove marks, use `marks(x) <- NULL`

or `unmark(x)`

.

##### Value

For `marks(x)`

, the result is a vector, factor or data frame,
containing the mark values attached to the tiles of `x`

.
If there are no marks, the result is `NULL`

.

For `unmark(x)`

, the result is the tessellation without marks.

For `marks(x) <- value`

, the result is the updated tessellation
`x`

(with the side-effect that the dataset `x`

is updated in
the current environment).

##### See Also

##### Examples

```
# NOT RUN {
D <- dirichlet(cells)
marks(D) <- tile.areas(D)
B <- lineardirichlet(runiflpp(5, simplenet))
marks(B) <- letters[1:5]
# }
```

*Documentation reproduced from package spatstat, version 1.63-0, License: GPL (>= 2)*