Hello All.
I am using polar.plot from the {plotrix} library to visualize individual coral colonies, dying, growing, etc through time. These coral colonies, that I visit annually happen to be delineated by a circular plot underwater; hence polar.plot is the best way to visualize my data. (I.e. This is not cyclical data that I am plotting.) I am trying to label individual data points (which correspond to actual coral colonies) with their identifying tag numbers. I have searched and searched and found no polar.plot with text labels on data points. I tried to coerce the "text" function (code below). But no dice. D = runif(29,0,7) #Distance from center of circular plot (in meters) H = runif(29,0,360) #Compass heading to center of circular plot (in degrees) polar.plot(D, H,rp.type = "dots", start = 90, point.col = "red") TagID = 200:228 #Labels of individual coral colonies text(D,H,TagID) #lame attempt at coercing the text function Is it possible to add text labels to data points in polar.plot? Any assistance will help save an endangered species. (Really!) Thank you! Sincerely, Tali Vardi, PhD Candidate Center for Marine Biodiversity and Conservation Scripps Institution of Oceanography |
On 05/06/2010 03:24 AM, Tali wrote:
> > Hello All. > > I am using polar.plot from the {plotrix} library to visualize individual > coral colonies, dying, growing, etc through time. These coral colonies, that > I visit annually happen to be delineated by a circular plot underwater; > hence polar.plot is the best way to visualize my data. (I.e. This is not > cyclical data that I am plotting.) I am trying to label individual data > points (which correspond to actual coral colonies) with their identifying > tag numbers. I have searched and searched and found no polar.plot with text > labels on data points. > > I tried to coerce the "text" function (code below). But no dice. > > D = runif(29,0,7) #Distance from center of circular plot (in > meters) > H = runif(29,0,360) #Compass heading to center of circular plot (in > degrees) > > polar.plot(D, H,rp.type = "dots", start = 90, point.col = "red") > > TagID = 200:228 #Labels of individual coral colonies > text(D,H,TagID) #lame attempt at coercing the text function > > > Is it possible to add text labels to data points in polar.plot? > What a great idea! radial.labels<-function(lengths,radial.pos,units="radians",start=0,clockwise=FALSE, labels,adj=NULL,pos=NULL,...) { if(units == "clock24") radial.pos<-pi*(450-radial.pos*15)/180 if(units == "polar") radial.pos<-pi*radial.pos/180 if(clockwise) radial.pos<--radial.pos if(start) radial.pos<-radial.pos+start # get the vector of x positions xpos<-cos(radial.pos)*lengths # get the vector of y positions ypos<-sin(radial.pos)*lengths text(xpos,ypos,labels,adj=adj,pos=pos,...) } You have now immortalized yourself in the plotrix NEWS file. The next version will include this function. Briefly, pass the same "lengths", pass your "polar.pos" as "radial.pos" and set units to "polar". The other arguments are the same as in radial.plot and text. > Any assistance will help save an endangered species. (Really!) I hope that the endangered species to be saved is humanity. Jim ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. |
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