This function returns an Extent object of a Raster* or Spatial* object (or an Extent object), or creates an Extent object from a 2x2 matrix (first row: xmin, xmax; second row: ymin, ymax), vector (length=4; order= xmin, xmax, ymin, ymax) or list (with at least two elements, with names 'x' and 'y')
bbox returns a sp package like 'bbox' object (a matrix)
extent(x, ...)Raster* or Extent object, a matrix, a bbox, or a vector of four numbers
Additional arguments. When x is a single number representing 'xmin', you can pass three additional numbers (xmax, ymin, ymax)
When x is a Raster* object, you can pass four additional arguments to crop the extent: r1, r2, c1, c2, representing the first and last row and column number
Extent object
# NOT RUN {
r <- raster()
extent(r)
extent(c(0, 20, 0, 20))
#is equivalent to
extent(0, 20, 0, 20)
extent(matrix(c(0, 0, 20, 20), nrow=2))
x <- list(x=c(0,1,2), y=c(-3,5))
extent(x)
#crop the extent by row and column numbers
extent(r, 1, 20, 10, 30)
# }
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