g.brownian.motion {animation}

Brownian Motion using Google Visualization API

Description

We can use R to generate random numbers from the Normal distribution and write them into an HTML document, then the Google Visualization gadget “motionchart” will prepare the animation for us (a Flash animation with several buttons).

Usage

g.brownian.motion(
  p = 20,
  start = 1900,
  digits = 14,
  file = "index.html",
  width = 800,
  height = 600
)

Arguments

p

number of points

start

start “year”; it has no practical meaning in this animation but it's the required by the Google gadget

digits

the precision to round the numbers

file

the HTML filename

width, height

width and height of the animation

Value

NULL. An HTML page will be opened as the side effect.

Note

The number of frames is controlled by ani.options('nmax') as usual.

Due to the “security settings” of Adobe Flash player, you might not be able to view the generated Flash animation locally, i.e. using an address like ‘⁠file:///C:/Temp/index.html⁠’. In this case, you can upload the HTML file to a web server and use the http address to view the Flash file.

Author(s)

Yihui Xie

References

https://developers.google.com/chart/?csw=1 and https://yihui.org/en/2008/11/brownian-motion-using-google-visualization-api-and-r/

See Also

brownian.motion, BM.circle, rnorm

Examples

if (interactive()) g.brownian.motion(15, digits = 2, width = 600, height = 500,
    file = "BM-motion-chart.html")