R Under development (unstable) (2024-01-28 r85838 ucrt) -- "Unsuffered Consequences"
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> ## This is my way of doing this now
> require(apsimx)
Loading required package: apsimx
APSIM(X) not found.
                        If APSIM(X) is installed in an alternative location,
                        set paths manually using 'apsimx_options' or 'apsim_options'.
                        You can still try as the package will look into the registry (under Windows)
> apsimx_options(warn.versions = FALSE)
> 
> extd.dir <- system.file("extdata", package = "apsimx")
> 
> run.test.edit.apsimx.batch <- get(".run.local.tests", envir = apsimx.options)
> 
> tmp.dir <- tempdir()
> 
> if(run.test.edit.apsimx.batch){
+ 
+   file.copy(paste0(extd.dir, "/", "Wheat.apsimx"), tmp.dir)
+ 
+   inspect_apsimx("Wheat.apsimx", src.dir = tmp.dir, node = "SurfaceOrganicMatter")
+ 
+   edit1time <- system.time(edit_apsimx("Wheat.apsimx", src.dir = tmp.dir,
+                                        wrt.dir = tmp.dir,
+                                        node = "SurfaceOrganicMatter", 
+                                        parm = "InitialResidueMass", value = 600))
+ 
+   inspect_apsimx("Wheat-edited.apsimx", src.dir = tmp.dir, node = "SurfaceOrganicMatter")
+ 
+   ## Using the 'batch' method
+   ## Let's say I want to edit 'SurfaceOrganicMatter'
+   ## InitialResidueMass from 500 to 650
+   ## Understanding the structure of JSON files
+   parms <- list(".Simulations.Simulation.Field.SurfaceOrganicMatter.InitialResidueMass" = 650)
+   edit2time <- system.time(edit_apsimx_batch("Wheat.apsimx", src.dir = tmp.dir, parms = parms))
+   inspect_apsimx("Wheat.apsimx", src.dir = tmp.dir, node = "SurfaceOrganicMatter")
+   
+   ## What is the difference in 'elapsed' real time?
+   edit2time[[3]]/edit1time[[3]]
+ } 
> 
> proc.time()
   user  system elapsed 
   0.90    0.17    1.01