Difference between revisions of "Polar rose plot"
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*[http://www25.brinkster.com/denshade/PolarFlower.html Applet to create rose with k parameter] | *[http://www25.brinkster.com/denshade/PolarFlower.html Applet to create rose with k parameter] | ||
*[http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/access/helpdesk/help/techdoc/ref/rose.html&http://www.mathworks.com/cgi-bin/texis/webinator/search/?db=MSS&prox=page&rorder=750&rprox=750&rdfreq=500&rwfreq=500&rlead=250&sufs=0&order=r&is_summary_on=1&ResultCount=10&query=rose&submitButtonName=Search MATLAB Function Reference - rose] | *[http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/access/helpdesk/help/techdoc/ref/rose.html&http://www.mathworks.com/cgi-bin/texis/webinator/search/?db=MSS&prox=page&rorder=750&rprox=750&rdfreq=500&rwfreq=500&rlead=250&sufs=0&order=r&is_summary_on=1&ResultCount=10&query=rose&submitButtonName=Search MATLAB Function Reference - rose] | ||
| − | *[http://mensch.org/vplot/windrose/ Wind rose] — | + | *[http://mensch.org/vplot/windrose/ Wind rose] — includes a [[Python]] script and examples. |
*[http://www.windpower.org/en/tour/wres/roseplot.htm Wind Rose Plotter Programme] | *[http://www.windpower.org/en/tour/wres/roseplot.htm Wind Rose Plotter Programme] | ||
*[[wikipedia:Polar coordinate system]] | *[[wikipedia:Polar coordinate system]] | ||
Latest revision as of 19:19, 5 July 2012
A polar rose plot (or roseplot / rose diagram and sometimes a rhodonea plot) is an angle histogram showing the distribution of values grouped according to their numeric range (viewed as a "polar plot"). It is similar to a polar rose (i.e. with r = cos(k*θ)) but not necessarily symmetric, as the symmetry (or "direction" of petals) is entirely dependent on the input data.
A roseplot is useful for viewing the "direction" of input data. It is commonly used for plotting the daily (or yearly, etc.) average wind direction at a given location (sometimes called a "wind direction plot" or a "wind rose").
Roseplots display degree, radian, or grad data versus a radial axis. Like histograms, roseplots display statistical data, showing the number of occurrences of an event that fall within a specific angular region.
I routinely use roseplots in my bioinformatics research. They are especially useful for getting an overview of amino acid- or nucleotide-usage in a given genome or sequence (see figure).
Equations
The polar equation of the rose is
r = α*sin(nθ) ~OR~ r = α*cos(nθ)
If n is odd, the rose is n-petalled. If n is even, the rose is 2n-petalled. Integer values of n give the kind of roseplots described in this article.
Related R packages
- climatol — see rosavent: Wind-rose plot
