Dear All,
I would like to plot a scalar (e.g. a temperature) on a non-rectangular
domain (or even better: I would simply like to be able to draw a contour
plot on an arbitrary 2D domain). I wonder if there is any tool to
achieve that with R. I did some online search in particular on the list
archives, found several queries similar to this one but was not able to
find any conclusive answer.
I am interested in the following 2 options
(1) just read a file of the form
x1 y1 z1
x2 y2 x2
... ... ...
xn yn zn
where the set of {xi} and {yi} are coordinates on an arbitrary domain
and {zi} are the values of the scalar for the corresponding {x,y}
coordinates.
(2) Sometimes the domain where I want to draw a contour plot is nothing
too fancy and the scalar itself is given by an analytical function.
Consider e.g. the case of a circle of radius R=pi/2 centered about the
origin and a function like
z=f(x,y)=abs(cos(y))
NB: in this case a satisfactory solution could be to plot z on a
rectangular grid and then clip a circular region
To fix the ideas, the final result in this case (with a colorjet map)
should look like this
http://dl.dropbox.com/u/5685598/scalar_plot.pdf
Any suggestion is appreciated.
Many thanks
Lorenzo
______________________________________________
R-help@r-project.org 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.
