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Set or get options shared across fasterRaster functions — faster • fasterRaster

faster() either sets or gets options used across fasterRaster functions. Its use can vary:

• Get current values of a particular option: Use faster("option_name"). Values will remain unchanged.

• Get current values of all options: Use faster() (no arguments). Values will remain unchanged.

• Get default values of a particular option: Use faster("option_name", default = TRUE). Values will remain unchanged.

• Get default values of all options: Use faster(default = TRUE). Values will remain unchanged.

• Set values of particular options: Use the form faster(option 1 = value1, option2 = value2).

• Set all options to their defaults: Use faster(restore = TRUE).

You cannot simultaneously get and set options.

To run most fasterRaster functions, you must set the grassDir option.

faster(..., default = FALSE, restore = FALSE)

...

Either:

• A character vector: Name(s) of option(s) to get values of;

• An option and the value of the option using an option = value pattern; or

• A names list with names that match the options you wish to change, and with values to assign to each option.

Options include:

• grassDir (character): The folder in which GRASS is installed on your computer. You must set this option to run most fasterRaster functions. Depending on your operating system, your install directory will look something like this:

  • Windows: "C:/Program Files/GRASS GIS 8.4"

  • Mac OS: "/Applications/GRASS-8.4.app/Contents/Resources"

  • Linux: "/usr/local/grass"

• addonsDir (character): Folder in which GRASS addons are stored. If NA and grassDir is not NA, this will be assumed to be file.path(grassDir, "addons"). The default values is NA.

• cores (integer/numeric integer): Number of processor cores to use on a task. The default is 2. Some GRASS modules are parallelized.

• memory (integer/numeric): The amount of memory to allocate to a task, in GB, for GRASS. The default is 2048 MB (i.e., 2 GB). Some GRASS modules can take advantage of more memory.

• useDataTable (logical): If FALSE (default), functions that return tabular output produce data.frames. If TRUE, output will be data.tables from the data.table package. This can be much faster, but it might require you to know how to use data.tables if you want to manipulate them in R. You can always convert them to data.frames using base::as.data.frame().

• verbose (logical): If TRUE, show progress during function operations and other messages. Default is FALSE. This overrides the value of any verbose argument in a function.

• debug (logical): If TRUE, show GRASS messages and otherwise hidden slots in classes. This is mainly used for debugging, so most users will want to keep this at its default, FALSE.

• workDir (character): The folder in which GRASS rasters, vectors, and other objects are created and manipulated. By default, this is given by tempdir(). Note that on some systems, changing the default folder to somewhere else can cause problems with fasterRaster being able to find rasters in GRASS that have been created.

default

Logical: Return the default value(s) of the option(s). The default value of default is FALSE.

restore

Logical: If TRUE, the all options will be reset to their default values. The default is FALSE.

If options are changed, then a named list of option values before they were changed is returned invisibly.

If option values are requested, a named list with option values is returned (not invisibly).

if (grassStarted()) {

# See current values for options:
faster("grassDir")
faster("cores")
faster("memory")
faster("useDataTable")
faster() # all options

# See default values for options:
faster("cores", default = TRUE)
faster(default = TRUE) # all options

# Set options (change accordingly for your system!!!)
if (FALSE) {

   opts. <- faster() # remember starting values of options

   faster(grassDir = "C:/Program Files/GRASS GIS 8.4")
   faster(verbose = TRUE, memory = 1024, cores = 1)

   faster(c("grassDir", "verbose", "memory", "cores"))

   faster(opts.) # reset options to starting values

}

}

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