subset_dollar {terra}

Subset a SpatRaster or a SpatVector

Description

Select a subset of layers from a SpatRaster or select a subset of records (row) and/or variables (columns) from a SpatVector.

Usage

## S4 method for signature 'SpatExtent'
x$name

Arguments

x

SpatRaster, SpatVector or SpatExtent

name

character. If x is a SpatRaster: layer name. If x is a SpatVector: variable name. If x is a SpatExtent: xmin, xmax, ymin or ymax

Value

if x is a SpatRaster: SpatRaster

if x is a SpatVector: SpatVector or, if drop=TRUE, a data.frame.

See Also

subset, [, [[, extract

Examples

### SpatRaster
s <- rast(system.file("ex/logo.tif", package="terra"))   
subset(s, 2:3)
subset(s, c(3,2,3,1))
#equivalent to 
s[[ c(3,2,3,1) ]]

s[[c("red", "green")]]
s$red

# expression based (partial) matching of names with single brackets
s["re"]
s["^re"]

# not with double brackets
# s[["re"]]


### SpatVector

v <- vect(system.file("ex/lux.shp", package="terra"))
v[2:3,]
v[1:2, 2:3]

subset(v, v$NAME_1 == "Diekirch", c("NAME_1", "NAME_2"))

subset(v, NAME_1 == "Diekirch", c(NAME_1, NAME_2), NSE=TRUE)