Blog Archives

simmer 4.2.1

January 19, 2019
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The 4.2.1 release of simmer, the Discrete-Event Simulator for R, is on CRAN with quite interesting new features and fixes. As discussed in the mailing list, there is a way to handle the specific case in which an arrival is rejected because a queue is full: library(simmer) reject % log_("kicked off...") patient

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simmer 4.1.0

November 9, 2018
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The 4.1.0 release of simmer, the Discrete-Event Simulator for R, is on CRAN. As per request in the mailing list, now get_global() is able to work inside a generator function. Moreover, the new add_global() method attaches a global attribute to a simulator. library(simmer) env % set_global("interarrival", 1, mod="+") generator

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simmer 4.0.1

September 28, 2018
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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,… Continuar leyendo simmer 4.0.1...

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Quantities for R – Ready for a CRAN release

August 30, 2018
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Quantities for R – Ready for a CRAN release

Latest enhancements Mixed units Support for correlations Fitting linear models with quantities Current issues Wrapping linear models ...

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Read the docs before questioning R’s defaults

August 22, 2018
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The latest R tip in Win-Vector Blog encourages you to Use Radix Sort based on a simple benchmark showing a x35 speedup compared to the default method, but with no further explanation. In my opinion, though, the complete tip would be, instead, use radix sort… if you know what you are doing, because a quick benchmark shouldn’t spare you the effort of actually reading the… Continuar leyendo Read the...

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Boost the speed of R calls from Rcpp

July 24, 2018
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If you are a user who needs to work with Rcpp-based packages, or you are a maintainer of one of such packages, you may be interested in the recent development of the unwind API, which can be leveraged to boost performance since the last Rcpp update. In a nutshell, until R 3.5.0, every R call from C++ code was… Continuar leyendo Boost the...

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simmer 4.0.0

July 21, 2018
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The 4.0.0 release of simmer, the Discrete-Event Simulator for R, is on CRAN under a new license: we decided to switch to GPL __= 2. Most notably in this major release, the C++ core has been refactorised and exposed under inst/include. This is not a big deal for most users, but it enables extensions. As an example… Continuar leyendo simmer 4.0.0...

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Data wrangling operations with quantities

June 26, 2018
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Compatibility with different workflows R base Tidyverse A note on data.table Future directions of units and errors Next steps This is the third blog post on quantities, an R-Consortium funded pro...

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simmer 3.8.0

May 7, 2018
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The 3.8.0 release of simmer, the Discrete-Event Simulator for R, hit CRAN almost a week ago, and Windows binaries are already available. This version includes two highly requested new features that justify this second consecutive minor release. Attachment of precomputed data Until v3.7.0, the generator was the only means to attach data to trajectories, and it was primarily… Continuar leyendo simmer 3.8.0...

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Using quantities to parse data with units and errors

May 6, 2018
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Reporting quantities Parsing quantities A flexible errors parser Unit parsing Summary Next steps This is the second blog post on quantities, an R-Consortium funded project for quantity calculus with ...

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