R version 4.4.0 RC (2024-04-16 r86468 ucrt) -- "Puppy Cup"
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> ## This file is part of SimInf, a framework for stochastic
> ## disease spread simulations.
> ##
> ## Copyright (C) 2015 -- 2022 Stefan Widgren
> ##
> ## SimInf is free software: you can redistribute it and/or modify
> ## it under the terms of the GNU General Public License as published by
> ## the Free Software Foundation, either version 3 of the License, or
> ## (at your option) any later version.
> ##
> ## SimInf is distributed in the hope that it will be useful,
> ## but WITHOUT ANY WARRANTY; without even the implied warranty of
> ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> ## GNU General Public License for more details.
> ##
> ## You should have received a copy of the GNU General Public License
> ## along with this program.  If not, see <https://www.gnu.org/licenses/>.
> 
> library(SimInf)
> library(tools)
> source("util/check.R")
> 
> model <- SIR(u0     = data.frame(S = 1:3, I = 4:6, R = 7:9),
+              tspan  = 1:10,
+              events = NULL,
+              beta   = 0,
+              gamma  = 0)
> 
> u0(model) <- data.frame(S = 10:12, I = 13:15, R = 16:18)
> stopifnot(identical(model@u0,
+                     matrix(c(10L, 11L, 12L,
+                              13L, 14L, 15L,
+                              16L, 17L, 18L),
+                            nrow = 3,
+                            ncol = 3,
+                            byrow = TRUE,
+                            dimnames = list(c("S", "I", "R"), NULL))))
> 
> stopifnot(identical(u0(model), data.frame(S = 10:12, I = 13:15, R = 16:18)))
> 
> res <- assertError(
+     u0(model) <- data.frame(S = 10:13, I = 14:17, R = 18:21))
> check_error(res, "The number of rows in 'u0' must match nodes in 'model'.")
> 
> proc.time()
   user  system elapsed 
   0.87    0.14    0.95