Archive for clouds
sunset [jatp]
Posted in Statistics with tags clouds, jatp, Mexico, Oaxaca, San Geminiano, sunset, winter light on December 19, 2021 by xi'an
new trajectories?
Posted in Books, Statistics with tags cirrus clouds, climate change, clouds, CO2, contrails, flight mode, global warming, Greenland, Nature, plane, plane exhaust, vapour on July 11, 2021 by xi'an
Lac d’Annecy [jatp]
Posted in Mountains, pictures, Running, Travel with tags Alps, Annecy, clouds, Hautes Alpes, jatp, Lac d'Annecy, sunset, vacations on May 24, 2021 by xi'an
Cap Fréhel [jatp]
Posted in pictures, Travel with tags Brittany, Cap Fréhel, Côtes d'Àrmor, Channel, clouds, island, jatp, sea, vacations on May 13, 2021 by xi'an
Metropolis in 95 characters
Posted in pictures, R, Statistics, Travel with tags 80th parallel North, clouds, codegolf, Gaussian random walk, Metropolis-Hastings algorithm, R, recursive function, sunset, Vancouver on January 2, 2020 by xi'an
Here is an R function that produces a Metropolis-Hastings sample for the univariate log-target f when the later is defined outside as another function. And when using a Gaussian random walk with scale one as proposal. (Inspired from a X validated question.)
m<-function(T,y=rnorm(1))ifelse(rep(T>1,T),
c(y*{f({z<-m(T-1)}[1])-f(y+z[1])<rexp(1)}+z[1],z),y)
The function is definitely not optimal, crashes for values of T larger than 580 (unless one modifies the stack size), and operates the most basic version of a Metropolis-Hastings algorithm. But as a codegolf challenge (on a late plane ride), this was a fun exercise.
Xi'an's Og 