rasterMaxMemory.R

library(raster)
r <- raster(matrix(rnorm(5e7), 5e3))
pryr::object_size(r)
print(r)

## decide if the above is easily dealt with in memory by your system
## and compare the result without setting this option (it creates a temp file for the crop)
## sure to set with rater's interface, not like:  #options(rasterMaxMemory = 1e9)
rasterOptions(maxmemory = 1e9)
crop(r, extent(0, .5, 0, 0.5))