Hi! I've been studying APSIM model for one year! But i don't know how to establish the relationship between R language and APSIM model. librarying the Rapsim package with R which is enough.how to prepare those simFiles, simFolders, simSuffix and osbfile ? where are the tutorials? and the code as follow is for Comparing simulated and measured values? Please take time out of your busy schedule to answer my questions. Have a nice day !!!
install.packages("devtools")
devtools::install_github("byzheng/rapsim")
force = TRUE
library(rapsim)

RApsim <- function(
para = NULL,
obsFile = NULL,
simFiles = NULL,
simFolders = NULL,
simSuffix = "outputfile_daily",
xvar = "DaysAfterSowing", ... )
{
para <- setpara( p = para, ... )

Create a new folder if the para$outputPrefix is a folder name

if ( !is.null( para$outputPrefix ) && ( right( para$outputPrefix ) == "/" | right( para$outputPrefix ) == "\" ) )
{
dir.create( para$outputPrefix, showWarnings = FALSE )
}

Read data

sim <- readsim( simFiles, simFolders, simSuffix )
obs <- readobs( obsFile )

Combine Data

sim.obs <- combineObsSim( obs, sim,
para$variables,
para$identifiers,
para$isOutputObsData )

Plot the data

all.plots <- NULL
all.plots[[length( all.plots ) + 1]] <-
plotObsSimCompare( sim.obs, para$identifiers, para$variables )

com.plots <- NULL
if ( !is.null( sim.obs[[xvar]] ) & xvar %in% para$identifiers$sim )
{
xlab <- "Days After Sowing (d)"
com.plots <- plotGraphCombinations( sim.obs,
graph.combinations = para$graph.combinations,
identifiers = para$identifiers,
variables = para$variables,
xvar = xvar,
isOutputObsData = para$isOutputObsData )

plots.num <- length( all.plots )
for ( i in 1:length( com.plots ) )
{
  plots.num <- plots.num + 1
  all.plots[[plots.num]] <- com.plots[[i]]
}

}

filename <- NULL
if ( para$outputPrefix == "" )
{
filename <- paste( "graph.simul-observed", ".", para$outputFormat, sep = "" )
}
else
{
filename <- paste( para$outputPrefix, ".", "graph.simul-observed", ".", para$outputFormat, sep = "" )
}

if ( para$outputFormat == "pdf" )
{
pdf( filename, paper = "a4", width = 8, height = 11, onefile = TRUE )
for ( i in 1:length( all.plots ) )
{
print( all.plots[[i]] )
}
dev.off()
}

}

library(APSIMWheatPhenology)
met <- system.file("extdata/weather.met", package = "APSIMWheatPhenology")
sim <- system.file("extdata/example.sim", package = "APSIMWheatPhenology")

Flowering time using parameter in the sim file

df <- wheatPhenology(sim, stages = 6, stageNames = 'flow', model = 'APSIM',
met = met, daily = FALSE)
#> Error: 'wcal' is not an exported object from 'namespace:weaana'
Created on 2022-02-20 by the reprex package (v2.0.1)

sessionInfo()
R version 4.1.2 (2021-11-01)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=Spanish_Latin America.1252
[2] LC_CTYPE=Spanish_Latin America.1252
[3] LC_MONETARY=Spanish_Latin America.1252
[4] LC_NUMERIC=C
[5] LC_TIME=Spanish_Latin America.1252

attached base packages:
[1] stats graphics grDevices utils datasets
[6] methods base

Hi Teacher Zheng

When I ran the apsimx example , I encountered the following problem（About the path）：

library(ApsimOnR)
library(CroptimizR)
library(dplyr)
library(nloptr)
library(DiceDesign)

TEST ON ONE MODEL and ONE VARIABLE

start_time <- Sys.time()

Select the model

simulation_name <- "GattonRowSpacingRowSpace25cm"

define the variables list

variable_names=c("Wheat.Leaf.LAI")

Getting apsimx file fro the package

apsimx_path="/usr/local/bin/Models" （In this here,I need to fill in the APSIM next generation installation path）
apsimx_path <- 'D:\Program Files\APSIMNG\Bin\Apsimx.exe' This is my Apsim NG installation path,but it's wrong
Error in system(cmd, wait = TRUE, intern = TRUE) : 'D:\Program' not found
Thank you in advance