rapsimng package is designed to modify and run the *.apsimx simulations using R in APSIM Next Generation.
Read APSIMX file
The wheat.apsimx in the validation dataset of APSIM NG is used as an example. Function read_apsimx is used to read *.apsimx file through jsonlite::read_json and returns as a list.
# Read Wheat.apsimx file with `read_apsimx` which returns a list of json results. file <- system.file("wheat.apsimx", package = "rapsimng") m <- read_apsimx(file)
Search by of APSIM NG
A node in the apsimx file can be found using the path specification in APSIM NG.
potential <- search_path(m, path = '[Structure].BranchingRate.PotentialBranchingRate.Vegetative.PotentialBranchingRate') potential
Replace the new model
new <- replace_model(m, potential$path, new_model)
Save into a new apsimx file
write_apsimx(new, tempfile(fileext = '.json'))
Run apsimx file
A function run_models is wrapped for APSIM NG Models.exe in the command line and can be called to run apsimx files. See APSIM website for documentation.