datasource

0th

Percentile

Are values in memory and/or on disk?

These are helper functons for programmers and for debugging that provide information about whether a Raster object has associated values, and if these are in memory or on disk.

fromDisk is TRUE if the data source is a file on disk; and FALSE if the object only exists in memory.

inMemory is TRUE if all values are currently in memory (RAM); and FALSE if not (in which case they either are on disk, or there are no values).

hasValues is TRUE if the object has cell values.

Keywords
spatial
Usage
fromDisk(x)
inMemory(x)
# S4 method for BasicRaster
hasValues(x, ...)
Arguments
x

Raster* object

additional arguments. None implemented

Value

Logical

Aliases
  • fromDisk
  • inMemory
  • hasValues
  • hasValues,BasicRaster-method
Examples
# NOT RUN {
rs <- raster(system.file("external/test.grd", package="raster"))
inMemory(rs)
fromDisk(rs)
rs <- readAll(rs)
inMemory(rs)
fromDisk(rs)
rs <- rs + 1
inMemory(rs)
fromDisk(rs)
rs <- raster(rs)
inMemory(rs)
fromDisk(rs)
rs <- setValues(rs, 1:ncell(rs))
inMemory(rs)
fromDisk(rs)
#rs <- writeRaster(rs, filename=rasterTmpFile(), overwrite=TRUE)
#inMemory(rs)
#fromDisk(rs)
# }
Documentation reproduced from package raster, version 3.3-13, License: GPL (>= 3)

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