gadget_areafile: Gadget area files

In mfdb: MareFrame DB Querying Library

Gadget area files

Description

Structures representing a GADGET area file

Usage

gadget_areafile(size, temperature, area = attr(size, 'area'))

Arguments

size	data.frame as produced by mfdb_area_size
temperature	data.frame as produced by mfdb_temperature
area	Optional. mfdb_group that you used to specify area. By default pulls it from annotations on the size object.

Details

Once formed, you can then use gadget_dir_write to write this out to a GADGET areafile.

Value

List of class 'gadget_areafile' that represents the area file contents.

Examples

# Open a temporary database connection
mdb <- mfdb(tempfile(fileext = '.duckdb'))

# Define 2 areacells of equal size
mfdb_import_area(mdb, data.frame(name=c("divA", "divB"), size=1))

# We want to have 3 area groups, 2 for original cells, one aggregating across the lot
area_group <- mfdb_group(
    divA = c("divA"),
    divB = c("divB"),
    divAB = c("divA", "divB"))

# Make up temperature data
temps <- expand.grid(year=c(1998,2000), month=c(1:12), areacell=c("divA", "divB"))
temps$temperature <- runif(nrow(temps), 5, 10)
mfdb_import_temperature(mdb, temps)

# Create an areafile from 2 mfdb queries
areafile <- gadget_areafile(
    mfdb_area_size(mdb, list(
        area = area_group))[[1]],
    mfdb_temperature(mdb, list(
        year = 1998:2000,
        timestep = mfdb_timestep_quarterly,
        area = area_group))[[1]])
areafile

# Write this to a gadget_directory
gadget_dir_write(gadget_directory(tempfile()), areafile)

# Check data in file matches input data
stopifnot(identical(
    areafile$size,
    c(divA=1, divB=1, divAB=2)))
stopifnot(all.equal(
    mean(areafile$temperature[areafile$temperature$area == 1, 'mean']),
    mean(temps[temps$areacell == 'divA', 'temperature']),
    tolerance = 1e-2))
stopifnot(all.equal(
    mean(areafile$temperature[areafile$temperature$area == 2, 'mean']),
    mean(temps[temps$areacell == 'divB', 'temperature']),
    tolerance = 1e-2))
stopifnot(all.equal(
    mean(areafile$temperature[areafile$temperature$area == 3, 'mean']),
    mean(temps[,'temperature']),
    tolerance = 1e-2))

mfdb_disconnect(mdb)

mfdb documentation built on June 21, 2022, 5:07 p.m.