[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
Hi
library(akima)
a<-data.frame(rnorm(100), rnorm(100), runif(100)*100)
image(interp(a[,1], a[,2], a[,3]))
Petr
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
an
> 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
the
> plot is coloured consequently.
>
> Thanks for your help
>
> Marc
> --
>
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