simmer 4.0.1
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The 4.0.1 release of simmer, the Discrete-Event Simulator for R, is on CRAN since a couple of weeks ago. There are few changes, notably new getters (get_sources()
, get_resources()
, get_trajectory()
) for simmer
environments and some improvements in resource selection policies (see details in help(select)
).
A new convenience function, when_activated
, makes it easier to generate arrivals on demand, triggered from trajectories. Let us consider, for instance, a simple restocking pattern:
library(simmer) restock <- trajectory() %>% log_("restock") serve <- trajectory() %>% log_("serve") %>% activate("Restock") env <- simmer() %>% add_generator("Customer", serve, at(1, 2, 3)) %>% add_generator("Restock", restock, when_activated()) %>% run() ## 1: Customer0: serve ## 1: Restock0: restock ## 2: Customer1: serve ## 2: Restock1: restock ## 3: Customer2: serve ## 3: Restock2: restock
Finally, this release leverages the new fast evaluation framework offered by Rcpp
(>= 0.12.18) by default, and includes some minor improvements and bug fixes.
New features:
- New getters (#159):
get_sources()
andget_resources()
retrieve a character vector of source/resource names defined in a simulation environment.get_trajectory()
retrieves a trajectory to which a given source is attached.
- New resource selection policies:
shortest-queue-available
,round-robin-available
,random-available
(#156). These are the same as the existing non-available
ones, but they exclude unavailable resources (capacity set to zero). Thus, if all resources are unavailable, an error is raised.
Minor changes and fixes:
- Rename
-DRCPP_PROTECTED_EVAL
(Rcpp >= 0.12.17.4) as-DRCPP_USE_UNWIND_PROTECT
(6d27671). - Keep compilation quieter with
-DBOOST_NO_AUTO_PTR
(70328b6). - Improve
log_
print (7c2e3b1). - Add
when_activated()
convenience function to easily generate arrivals on demand from trajectories (#161 closing #160). - Enhance
schedule
printing (9c66285). - Fix generator-manager name clashing (#163).
- Deprecate
set_attribute(global=TRUE)
,get_attribute(global=TRUE)
andtimeout_from_attribute(global=TRUE)
(#164), the*_global
versions should be used instead.
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