secr (version 3.0.1)

subset.mask: Subset Mask Object

Description

Retain selected rows of a mask object.

Usage

# S3 method for mask
subset(x, subset, ...)
# S3 method for mask
rbind(...)

Arguments

x

mask object

subset

numeric or logical vector to select rows of mask

…

two or more mask objects (rbind only)

Value

For subset, an object of class `mask' with only the requested subset of rows and `type' attribute set to `subset'.

For rbind, an object of class `mask' with all unique rows from the masks in …, and `type' attribute set to `rbind'.

Warning

The spacing attribute is carried over from the input (it is not updated automatically). In the case of very sparse masks (i.e. those with isolated points) this may lead to an unexpected value for this attribute. (Automatic updating requires excessive computation time and/or memory for very large masks).

Details

The subscripts in subset may be of type integer, character or logical as described in Extract.

Covariates are ignored by rbind.mask.

See Also

mask

Examples

tempmask <- make.mask(make.grid())
OK <- (tempmask$x + tempmask$y) > 100
tempmask <- subset(tempmask, subset = OK)
plot(tempmask)