Articles by Iñaki Úcar

simmer.bricks 0.1.0: new add-on for simmer

January 17, 2018 | Iñaki Úcar

The new package simmer.bricks has found its way to CRAN. The simmer package provides a rich and flexible API to build discrete-event simulations. However, there are certain recurring patterns that are typed over and over again, higher-level tasks which can be conceptualised in concrete activity sequences. This new package ... [Read more...]

simmer 3.6.5

January 4, 2018 | Iñaki Úcar

The fifth update of the 3.6.x release of simmer, the Discrete-Event Simulator for R, is on CRAN. This release extends the attributes API by allowing users to set/get multiple attributes at once (a pretty straightforward change as well as useful; I don’t know why it didn’t occurred ... [Read more...]

Visualising SSH attacks with R

November 30, 2017 | Iñaki Úcar

If you have any machine with an SSH server open to the world and you take a look at your logs, you may be alarmed to see so many login attempts from so many unknown IP addresses. DenyHosts is a pretty neat service for Unix-based systems which works in the ...
[Read more...]

simmer 3.6.4

November 7, 2017 | Iñaki Úcar

The fourth update of the 3.6.x release of simmer, the Discrete-Event Simulator for R, is on CRAN. This release patches several bugs regarding resource priority and preemption management when seized amounts greater than one were involved. Check the examples available in the corresponding issues on GitHub (#114, #115, #116) to know if you ... [Read more...]

simmer 3.6.3

July 28, 2017 | Iñaki Úcar

The third update of the 3.6.x release of simmer, the Discrete-Event Simulator for R, is on CRAN. First of all and once again, I must thank Duncan Garmonsway (@nacnudus) for writing a new vignette: “The Bank Tutorial: Part II”. Among various fixes and performance improvements, this release provides a way ... [Read more...]

Programming with dplyr by using dplyr

July 23, 2017 | Iñaki Úcar

The title may seem tautological, but since the arrival of dplyr 0.7.x, there have been some efforts at using dplyr without actually using it that I can’t quite understand. The tidyverse has raised passions, for and against it, for some time already. There are excellent alternatives out there, and ... [Read more...]

constants 0.0.1

July 18, 2017 | Iñaki Úcar

The new constants package is available on CRAN. This small package provides the CODATA 2014 internationally recommended values of the fundamental physical constants (universal, electromagnetic, physicochemical, atomic…), provided as symbols for direct use within the R language. Optionally, the values with errors and/or the values with units are also provided ... [Read more...]

simmer 3.6.2

May 31, 2017 | Iñaki Úcar

The second update of the 3.6.x release of simmer, the Discrete-Event Simulator for R, is on CRAN, thus inaugurating a bi-monthly release cycle. I must thank Duncan Garmonsway (@nacnudus) for creating and now maintaining “The Bank Tutorial: Part I” vignette, Franz Fuchs for finding an important and weird memory bug (... [Read more...]

x + x is not 2x

May 18, 2017 | Iñaki Úcar

A few days ago, Joel Courtheyn posted the following issue in the errors package repository on GitHub: Experimenting with the new package I detected a difference in calculation of the error depending on the way a formula was written. Originally I tried to calculate the error for z1
[Read more...]

errors 0.0.1

April 24, 2017 | Iñaki Úcar

In physics, engineering and other disciplines, a single number, a bare quantity, is useless, meaningless. When you measure something, your results will be within the precision of your equipment, and then you need to propagate those errors up to whatever final indirect measure you are interested in. Finally, you need ... [Read more...]

simmer 3.6.1

April 3, 2017 | Iñaki Úcar

A new patch release of simmer, the Discrete-Event Simulator for R, is on CRAN. Three months have passed since the last release. The last year was a period of intense development (one release per month). Now, the package has reached some level of maturity, so we intend to extend the ...
[Read more...]
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