Manu

C*: pitch

Sun 07 September 2014

The axes is the most documented one. Maybe because it is the less easy to understand. Of course other post will consider the two other axes.

The complication arise when thinking of what can be controlled:

the plane's stability (called "assiette" in french) and therefore the pitch rate.
the angle …

Category: aviation Tagged: C star

Tue 02 September 2014

C* testbed (Photo credit: Wikipedia)

I begun a serie of post dedicated to fly-by-wire explanation. I focus on C* command law as it is the most documented one. All posts from this serie will be available under the C* tag on this blog.

Some of the article are in french …

Category: aviation Tagged: C star Fly-by-wire

Tue 26 August 2014

I want to focus on notes changes. this is what I want to analyze some music sheet to count changes.

State of the art

The first article I found is [paiement2007][1. Paiement, J. F., Grandvalet, Y., Bengio, S., & Eck, D. (2007). A generative model for rhythms. NIPS’2007 Music …

Category: maths Tagged: Andrei Markov Arts Finite-state machine Markov chain Music Sheet music music maths

Mon 11 August 2014

This morning, I found the default behavior of the mclapply() function not quite different from the one of the lapply(). After quick investigation, I found is was due to an option not correctly set: the number of core to use.

> getOption("cores")
NULL

I must then overwrite the default mc …

Category: programming Tagged: R programming useless

Wed 06 August 2014

[caption id="" align="alignright" width="350"] Doubly-linked list (Photo credit: Wikipedia)[/caption]

This a retranscription of a post on stackoverflow.

The solution I keep is using the following command

a <- strsplit(scan("data.txt", what="", sep="n"), "t")

Category: programming Tagged: R Stack Overflow programming

Mon 28 July 2014

[caption id="" align="alignright" width="75"] Group by (Photo credit: Wikipedia)[/caption]

The use case is similar to the one descibe in usual SQL quick reference guide at the "group by" section.
first of all, I need a dataset as one data.frame:
d <- data.frame(product=sample(c("fruit …

Category: how to Tagged: Aggregate Group by R SQL programming

Tue 22 July 2014

English: Map of the area around the village of...

Evaluation of occupation type over a grid (Photo credit: Wikipedia)

For some application, it is usefull to evaluate some physical value over a grid. For each dimension of the grid, the order of magnitude to use is not obvious.Watch movie online The Transporter Refueled (2015)

grid evaluation

the function …

Category: tools Tagged: Programming R Regular grid how to programming

Thu 17 July 2014

Consider the following R code:
a <- factor(floor(rnorm(100)))        class(a)        summary(a)
Why should you have that? great question. Maybe because of memory
place. I really don’t know, but I received some R dataset in the form
of a factor. My problem is to revert this process …

Category: R Tagged: how to programming R useless