[R] plot two variograms on a same graph

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Jun 10 14:28:21 CEST 2009


Dear Damien,

I tend do use ggplot2 for more advanced plotting. You only have to
create a dataframe with all the data you need. Here are some examples.

	library(gstat)
	library(ggplot2)
	data(meuse)
	coordinates(meuse) = ~x+y
	g1 <- gstat(id = "Raw", formula = log(zinc)~1, data = meuse)
	g2 <- gstat(id = "Linear trend", formula = log(zinc)~x+y, data =
meuse)
	vg1 <- variogram(g1)
	vg2 <- variogram(g2)
	ggplot(rbind(vg1, vg2), aes(x = dist, y = gamma, colour = id)) +
geom_point()
	
	vgm1 <- fit.variogram(vg1, vgm(1, "Sph", 700, 1))
	vgm2 <- fit.variogram(vg2, vgm(1, "Sph", 700, 1))
	vgLine <- rbind(
		cbind(variogramLine(vgm1, maxdist = max(vg1$dist)), id =
"Raw"),
		cbind(variogramLine(vgm2, maxdist = max(vg2$dist)), id =
"Linear trend")
	)
	ggplot(rbind(vg1, vg2), aes(x = dist, y = gamma, colour = id)) +
geom_line(data = vgLine) + geom_point()
 
HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens damien landais
Verzonden: woensdag 10 juni 2009 13:55
Aan: R-help at r-project.org
Onderwerp: [R] plot two variograms on a same graph

Hi,
I would know how to plot two variograms on a same graph. I can plot one
by one but I would draw both on the same one.
Is it possible? Do i need any special package?

Thanks!

Cordialement
Damien Landais

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