File extensions map

How to load various types of files in R.

This function has two roles: 1) to proceed with the loading of files that are in a simList or 2) as a short cut to simInit(inputs = filelist). Generally not to be used by a user.

A data.frame with information on how to load various types of files in R, containing the columns:

• exts: the file extension;

• fun: the function to use for files with this file extension;

• package: the package from which to load fun.

.fileExtensions()

loadFiles(sim, filelist, ...)

# S4 method for simList,missing
loadFiles(sim, filelist, ...)

# S4 method for missing,ANY
loadFiles(sim, filelist, ...)

# S4 method for missing,missing
loadFiles(sim, filelist, ...)

.saveFileExtensions()

Arguments

sim	simList object.
filelist	list or data.frame to call loadFiles directly from the filelist as described in Details
...	Additional arguments.

See also

inputs

Author

Eliot McIntire and Alex Chubaty

Examples

if (FALSE) {

# Load random maps included with package
filelist <- data.frame(
    files = dir(system.file("maps", package = "quickPlot"),
            full.names = TRUE, pattern = "tif"),
    functions = "rasterToMemory", package = "quickPlot"
)
sim1 <- loadFiles(filelist = filelist)
clearPlot()
if (interactive()) Plot(sim1$DEM)

# Second, more sophisticated. All maps loaded at time = 0, and the last one is reloaded
#  at time = 10 and 20 (via "intervals").
# Also, pass the single argument as a list to all functions...
#  specifically, when add "native = TRUE" as an argument to the raster function
files = dir(system.file("maps", package = "quickPlot"),
            full.names = TRUE, pattern = "tif")
arguments = I(rep(list(native = TRUE), length(files)))
filelist = data.frame(
   files = files,
   functions = "raster::raster",
   objectName = NA,
   arguments = arguments,
   loadTime = 0,
   intervals = c(rep(NA, length(files)-1), 10)
)

sim2 <- loadFiles(filelist = filelist)

# if we extend the end time and continue running, it will load an object scheduled
#  at time = 10, and it will also schedule a new object loading at 20 because
#  interval = 10
end(sim2) <- 20
sim2 <- spades(sim2) # loads the percentPine map 2 more times, once at 10, once at 20
}