[R] Odp: image() plot with z not in matrix format

Petr PIKAL petr.pikal at precheza.cz
Thu Nov 29 13:07:12 CET 2007


a<-data.frame(rnorm(100), rnorm(100), runif(100)*100)
image(interp(a[,1], a[,2], a[,3]))

petr.pikal at precheza.cz

r-help-bounces at r-project.org napsal dne 29.11.2007 12:52:32:

> Hello R cracks
> The image() function requires strictly increasing x and y values and z 
as a matrix.
> Actually, I don't have equally spaced variables, but anyway want to plot 
> colored image() (with z-information).
> An example of my problem is here:
> a<-data.frame(rnorm(100), rnorm(100), runif(100)*100)
> How can I plot this data as an image (x=a[,1], y=a[,2] and z=a[,3])-> 
> according to ?image.
> It has to be possible to adapt the grid size so that every grid cell in 
> plot is coloured consequently.
> Thanks for your help
> Marc
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