xmin(x)
xmax(x)
ymin(x)
ymax(x)
xmin(x) <- value
xmax(x) <- value
ymin(x) <- value
ymax(x) <- value
extent
, dimensions
r <- raster(xmn=-0.5, xmx = 9.5, ncols=10)
xmin(r)
xmax(r)
ymin(r)
ymax(r)
xmin(r) <- -180
xmax(r) <- 180
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