[R] suggestions for plotting 5000 data points

[Uwe Ligges]

Typical suggestions would be to sample from the data or use alpha 
blending (translucency).

Best wishes;
uwe Ligges


Tania Oh wrote:
> Dear all,
> 
> I have a collection of 5000 entries which represent the evolutionary 
> rates of 3 animals.
> 
> I would like to show the differences between the rates of all 3 animals 
> and have tried using the function parallel (from the lattice package) 
> and pairs() function.
> 
> The parallel function would have been perfect save for the large number 
> of data (5000). The pairs() function doesn't show the difference 
> explicitly. Does anyone have any suggestions on representing such data 
> or have done similar plots?
> 
> I attach some simulated data:
> 
> mat3 <-matrix(sample(1:5000),nrow=5000,ncol=3, byrow=TRUE)
> colnames(mat3) <- c("human","mouse", "chicken")
> mat3 <-data.frame(mat3)
> mat2$model <- factor( rep(  "Model 3"),  labels="model3")
> 
> 
> ## code I used for parallel
> 
> require(lattice)
> parallel( ~ mat3[1:3]|model , mat3,varnames = c("human\ndnds", 
> "mouse\ndnds", "chicken\ndnds") )
> 
> 
> any suggestions or pointers would be greatly appreciated.
> 
> many thanks
> tania
> 
> D.phil student
> Department of Physiology, Anatomy and Genetics
> 
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