From: Sander Oom <slist_at_oomvanlieshout.net>

Date: Sat 28 May 2005 - 06:27:37 EST

http://soil.scijournals.org/content/vol65/issue4/images/large/1038f2.jpeg

require(vcd)

require(Zelig)

ternaryplot(x,

)

oldpar <- par(no.readonly=TRUE)

segments(x1,y1,x2,y2)

text(x1,y1-0.03,as.character(rev(seq(10,90,by=10)))) #, cex=0.8) ## now the left internal ticks

segments(x1,y1,x2,y2)

text(x1-0.03,y1+0.015,as.character(seq(10,90,by=10))) ## now the right internal ticks

x1<-rev(x1+0.5-ticlength*sin60)

x2<-x1+ticlength*sin60

segments(x1,y2,x2,y1)

text(x2+0.03,y1+0.015,as.character(rev(seq(10,90,by=10))))

text(0.5,0.57,"Clay", col="grey")

# lower bound of clay loam & silty divider

segments(x1,y1,x2,y2, col="grey")

y1<-c(0.37*sin60,0.2*sin60,0.2*sin60) y2<-c(0.37*sin60,0.2*sin60,0.285*sin60)

tmp[,1] <- 100-tmp[,2]-tmp[,3]

col <- rep("black",10)

pch <- rep(1, 10)

plot.soiltexture(tmp,pch,col="black")

*>
*

*>
*

Date: Sat 28 May 2005 - 06:27:37 EST

Cleaned up the class divisions and created a full function.

- rotate axis labels; - correct the partial covering of the bottom tick labels; - rotate ticks in order to simplify viewing the graph.See:

http://soil.scijournals.org/content/vol65/issue4/images/large/1038f2.jpeg

Wonder whether triangle.plot{ade4} will give more flexibility!?

Anyway, hopefully the result so far is useful for other people.

Cheers,

Sander.

plot.soiltexture <- function(x,pch,col) {

## triangle plots: ## triangle.plot {ade4} ## triplot{klaR} ## ternaryplot {vcd}

require(vcd)

require(Zelig)

ternaryplot(x,

grid=FALSE, dimnames.position = "none", pch=pch, col=col, scale=1, main=NULL, prop.size=FALSE

)

oldpar <- par(no.readonly=TRUE)

ticlength <- 0.01

## now the bottom internal ticks

x1<-seq(0.1,0.9,by=0.1) x2<-x1 y1<-rep(0,9) y2<-rep(ticlength,9)

segments(x1,y1,x2,y2)

text(x1,y1-0.03,as.character(rev(seq(10,90,by=10)))) #, cex=0.8) ## now the left internal ticks

y1<-x1*sin60 x1<-x1*0.5 x2<-x1+ticlength*sin60 y2<-y1-ticlength*0.5

segments(x1,y1,x2,y2)

text(x1-0.03,y1+0.015,as.character(seq(10,90,by=10))) ## now the right internal ticks

x1<-rev(x1+0.5-ticlength*sin60)

x2<-x1+ticlength*sin60

segments(x1,y2,x2,y1)

text(x2+0.03,y1+0.015,as.character(rev(seq(10,90,by=10))))

## the labels at the corners

par(xpd=TRUE)

# text(0.5,0.9,"100% clay") # text(-0.1,0,"100% sand") # text(1.1,0,"100% loam")

## the axis labels

text(0.09,0.43,"% Clay") text(0.90,0.43,"% Silt") text(0.5,-0.1,"% Sand")

# boundary of clay with extensions

x1<-c(0.275,0.355,0.6) x2<-c(0.415,0.8,0.7) y1<-c(0.55*sin60,0.4*sin60,0.4*sin60) y2<-c(0.285*sin60,0.4*sin60,0.6*sin60)segments(x1,y1,x2,y2, col="grey")

text(0.5,0.57,"Clay", col="grey")

# lower bound of clay loam & silty divider

x1<-c(0.415,0.66) x2<-c(0.856,0.6) y1<-c(0.285*sin60,0.285*sin60) y2<-c(0.285*sin60,0.40*sin60)

segments(x1,y1,x2,y2, col="grey")

text(0.7,0.49*sin60,"Silty", col="grey") text(0.7,0.44*sin60,"clay", col="grey") text(0.72,0.36*sin60,"Silty clay", col="grey") text(0.73,0.32*sin60,"loam", col="grey") text(0.5,0.35*sin60,"Clay loam", col="grey") x1<-c(0.185,0.1,0.37) x2<-c(0.37,0.37,0.415)

y1<-c(0.37*sin60,0.2*sin60,0.2*sin60) y2<-c(0.37*sin60,0.2*sin60,0.285*sin60)

segments(x1,y1,x2,y2, col="grey") text(0.28,0.43*sin60,"Sandy", col="grey") text(0.27,0.39*sin60,"clay", col="grey")text(0.27,0.3*sin60,"Sandy clay", col="grey") text(0.27,0.26*sin60,"loam", col="grey") # sand corner

x1<-c(0.05,0.075) x2<-c(0.15,0.3) y1<-c(0.1*sin60,0.15*sin60) y2<-c(0,0) segments(x1,y1,x2,y2, col="grey") text(0.25,0.13*sin60,"Sandy loam", col="grey") text(0.14,0.07*sin60,"Loamy", col="grey")text(0.18,0.03*sin60,"sand", col="grey") text(0.06,0.021,"Sand", col="grey")

x1<-c(0.37,0.435,0.5,0.8,0.86) x2<-c(0.435,0.537,0.64,0.86,0.94) y1<-c(0.2*sin60,0.08*sin60,0,0,0.12*sin60) y2<-c(0.08*sin60,0.08*sin60,0.285*sin60,0.12*sin60,0.12*sin60) segments(x1,y1,x2,y2, col="grey") text(0.49,0.18*sin60,"Loam", col="grey")text(0.72,0.15*sin60,"Silt loam", col="grey") text(0.9,0.06*sin60,"Silt", col="grey")

ternarypoints(x, pch = pch, col = col)

par(oldpar)

}

tmp <- array(dim=c(10,3)) tmp[,2] <- abs(rnorm(10)*20) tmp[,3] <- abs(rnorm(10)*10)

tmp[,1] <- 100-tmp[,2]-tmp[,3]

col <- rep("black",10)

pch <- rep(1, 10)

plot.soiltexture(tmp,pch,col="black")

Sander Oom wrote:

> Right,

*>
**> Got the data points plotted on top of the soil texture background,
**> thanks to Jim and ternaryplot{vcd}! See code below.
**>
**> Now there is some fine tuning to do, as it should really look like this
**> graph:
**> http://soil.scijournals.org/content/vol65/issue4/images/large/1038f2.jpeg
**>
**> Things to do:
**> - rotate axis labels;
**> - correct small errors in class divisions;
**> - correct the partial covering of the bottom tick labels;
**> - rotate ticks in order to simplify viewing the graph.
**>
**> Any help still appreciated!
**>
**> Cheers,
**>
**> Sander.
**>
**>
**> soil.triangle <- function() {
**> oldpar <- par(no.readonly=TRUE)
**> ## now the bottom internal ticks
**> x1<-seq(0.1,0.9,by=0.1)
**> x2<-x1
**> y1<-rep(0,9)
**> y2<-rep(-0.02,9)
**> segments(x1,y1,x2,y2)
**> text(x1,y1-0.03,as.character(rev(seq(10,90,by=10)))) #, cex=0.8)
**> ## now the left internal ticks
**> y1<-x1*sin60
**> x1<-x1*0.5
**> x2<-x1+0.02*sin60
**> y2<-y1-0.02*0.5
**> segments(x1,y1,x2,y2)
**> text(x1-0.03,y1+0.015,as.character(seq(10,90,by=10)))
**> ## now the right internal ticks
**> x1<-rev(x1+0.5-0.02*sin60)
**> x2<-x1+0.02*sin60
**> segments(x1,y2,x2,y1)
**> text(x2+0.03,y1+0.015,as.character(rev(seq(10,90,by=10))))
**> ## the labels at the corners
**> par(xpd=TRUE)
**> # text(0.5,0.9,"100% clay")
**> # text(-0.1,0,"100% sand")
**> # text(1.1,0,"100% loam")
**> text(0.09,0.43,"% Clay")
**> text(0.90,0.43,"% Silt")
**> text(0.5,-0.1,"% Sand")
**> # boundary of clay with extensions
**> x1<-c(0.275,0.35,0.6)
**> x2<-c(0.4,0.79,0.7)
**> y1<-c(0.55*sin60,0.41*sin60,0.41*sin60)
**> y2<-c(0.285*sin60,0.41*sin60,0.6*sin60)
**> segments(x1,y1,x2,y2, col="grey")
**> text(0.5,0.57,"Clay", col="grey")
**> # lower bound of clay loam & silty divider
**> x1<-c(0.4,0.68)
**> x2<-c(0.86,0.6)
**> y1<-c(0.285*sin60,0.285*sin60)
**> y2<-c(0.285*sin60,0.41*sin60)
**> segments(x1,y1,x2,y2, col="grey")
**> text(0.7,0.49*sin60,"Silty", col="grey")
**> text(0.7,0.44*sin60,"clay", col="grey")
**> text(0.73,0.37*sin60,"Silty clay", col="grey")
**> text(0.73,0.33*sin60,"loam", col="grey")
**> text(0.5,0.35*sin60,"Clay loam", col="grey")
**> x1<-c(0.185,0.1,0.37)
**> x2<-c(0.36,0.37,0.4)
**> y1<-c(0.37*sin60,0.2*sin60,0.2*sin60)
**> y2<-c(0.37*sin60,0.2*sin60,0.285*sin60)
**> segments(x1,y1,x2,y2, col="grey")
**> text(0.27,0.43*sin60,"Sandy", col="grey")
**> text(0.27,0.39*sin60,"clay", col="grey")
**> text(0.27,0.3*sin60,"Sandy clay", col="grey")
**> text(0.27,0.26*sin60,"loam", col="grey")
**> # sand corner
**> x1<-c(0.05,0.075)
**> x2<-c(0.12,0.3)
**> y1<-c(0.1*sin60,0.15*sin60)
**> y2<-c(0,0)
**> segments(x1,y1,x2,y2, col="grey")
**> text(0.25,0.13*sin60,"Sandy loam", col="grey")
**> text(0.13,0.075*sin60,"Loamy", col="grey")
**> text(0.15,0.035*sin60,"sand", col="grey")
**> text(0.055,0.021,"Sand", col="grey")
**> x1<-c(0.37,0.42,0.5,0.8,0.86)
**> x2<-c(0.42,0.54,0.65,0.86,0.94)
**> y1<-c(0.2*sin60,0.08*sin60,0,0,0.12*sin60)
**> y2<-c(0.08*sin60,0.08*sin60,0.285*sin60,0.12*sin60,0.12*sin60)
**> segments(x1,y1,x2,y2, col="grey")
**> text(0.49,0.18*sin60,"Loam", col="grey")
**> text(0.72,0.15*sin60,"Silt loam", col="grey")
**> text(0.9,0.06*sin60,"Silt", col="grey")
**> par(oldpar)
**> }
**>
**> tmp <- array(dim=c(10,3))
**> tmp[,1] <- abs(rnorm(10)*20)
**> tmp[,2] <- abs(rnorm(10)*10)
**> tmp[,3] <- 100-tmp[,1]-tmp[,2]
**> tmp
**>
**> library(vcd)
**> ## Mark groups
**> ternaryplot(tmp,
**> grid=FALSE,
**> dimnames.position = "none",
**> pch=1, col="black",
**> scale=1, main=NULL,
**> prop.size=FALSE,
**> )
**> soil.triangle()
**>
**>
**> Sander Oom wrote:
*

>> Hi Jim, >> >> This looks impressive! It gives me the 'background' graph. However, >> I'm not sure how I can use this function to plot my soil texture >> values! Can you explain? >> >> I would like to be able to plot my soil texture samples in the same >> graph as the one your function plots. >> >> Maybe I should try to figure out how to replicate your code inside a >> ternaryplot{vcd} call. >> >> Cheers, >> >> Sander. >> >> Jim Lemon wrote: >> > Sander Oom wrote: >> >> Dear R users, >> >> >> >> has anybody made an attempt to create the soil texture triangle graph >> >> in R? For an example see here: >> >> >> >> http://www.teachingkate.org/images/soiltria.gif >> >> >> >> I would like to get the lines in black and texture labels in gray to >> >> allow for plotting my texture results on top. >> >> >> >> Any examples or suggestions are very welcome! >> >> >> > It's not too hard to write a plot function to do this, but I'm not >> sure >> > whether this will be what you want. Anyway, try it out. >> > >> > Jim >> > >> > >> ------------------------------------------------------------------------ >> > >> > soil.triangle<-function() { >> > oldpar<-par(no.readonly=TRUE) >> > plot(0:1,type="n",axes=FALSE,xlim=c(0,1.1),ylim=c(0,1), >> > main="Soil Triangle",xlab="",ylab="") >> > # first draw the triangle >> > x1<-c(0,0,0.5) >> > sin60<-sin(pi/3) >> > x2<-c(1,0.5,1) >> > y1<-c(0,0,sin60) >> > y2<-c(0,sin60,0) >> > segments(x1,y1,x2,y2) >> > # now the bottom internal ticks >> > x1<-seq(0.1,0.9,by=0.1) >> > x2<-x1 >> > y1<-rep(0,9) >> > y2<-rep(0.02,9) >> > segments(x1,y1,x2,y2) >> > text(x1,y1-0.03,as.character(rev(seq(10,90,by=10)))) >> > # now the left internal ticks >> > y1<-x1*sin60 >> > x1<-x1*0.5 >> > x2<-x1+0.02*sin60 >> > y2<-y1-0.02*0.5 >> > segments(x1,y1,x2,y2) >> > text(x1-0.03,y1+0.015,as.character(seq(10,90,by=10))) >> > x1<-rev(x1+0.5-0.02*sin60) >> > x2<-x1+0.02*sin60 >> > segments(x1,y2,x2,y1) >> > text(x2+0.03,y1+0.015,as.character(rev(seq(10,90,by=10)))) >> > text(0.5,0.9,"100% clay") >> > par(xpd=TRUE) >> > text(-0.1,0,"100% sand") >> > text(1.1,0,"100% loam") >> > text(0.07,0.43,"percent clay") >> > text(0.93,0.43,"percent silt") >> > text(0.5,-0.1,"percent sand") >> > # boundary of clay with extensions >> > x1<-c(0.275,0.35,0.6) >> > x2<-c(0.4,0.79,0.7) >> > y1<-c(0.55*sin60,0.41*sin60,0.41*sin60) >> > y2<-c(0.285*sin60,0.41*sin60,0.6*sin60) >> > segments(x1,y1,x2,y2) >> > text(0.5,0.57,"Clay") >> > # lower bound of clay loam & silty divider >> > x1<-c(0.4,0.68) >> > x2<-c(0.86,0.6) >> > y1<-c(0.285*sin60,0.285*sin60) >> > y2<-c(0.285*sin60,0.41*sin60) >> > segments(x1,y1,x2,y2) >> > text(0.7,0.49*sin60,"Silty") >> > text(0.7,0.44*sin60,"clay") >> > text(0.73,0.37*sin60,"Silty clay") >> > text(0.73,0.33*sin60,"loam") >> > text(0.5,0.35*sin60,"Clay loam") >> > x1<-c(0.185,0.1,0.37) >> > x2<-c(0.36,0.37,0.4) >> > y1<-c(0.37*sin60,0.2*sin60,0.2*sin60) >> > y2<-c(0.37*sin60,0.2*sin60,0.285*sin60) >> > segments(x1,y1,x2,y2) >> > text(0.27,0.43*sin60,"Sandy") >> > text(0.27,0.39*sin60,"clay") >> > text(0.27,0.3*sin60,"Sandy clay") >> > text(0.27,0.26*sin60,"loam") >> > # sand corner >> > x1<-c(0.05,0.075) >> > x2<-c(0.12,0.3) >> > y1<-c(0.1*sin60,0.15*sin60) >> > y2<-c(0,0) >> > segments(x1,y1,x2,y2) >> > text(0.25,0.13*sin60,"Sandy loam") >> > text(0.13,0.075*sin60,"Loamy") >> > text(0.15,0.035*sin60,"sand") >> > text(0.055,0.021,"Sand") >> > x1<-c(0.37,0.42,0.5,0.8,0.86) >> > x2<-c(0.42,0.54,0.65,0.86,0.94) >> > y1<-c(0.2*sin60,0.08*sin60,0,0,0.12*sin60) >> > y2<-c(0.08*sin60,0.08*sin60,0.285*sin60,0.12*sin60,0.12*sin60) >> > segments(x1,y1,x2,y2) >> > text(0.49,0.18*sin60,"Loam") >> > text(0.72,0.15*sin60,"Silt loam") >> > text(0.9,0.06*sin60,"Silt") >> > par(oldpar) >> > } >> >> ______________________________________________ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! >> http://www.R-project.org/posting-guide.html >>

-- -------------------------------------------- Dr Sander P. Oom Animal, Plant and Environmental Sciences, University of the Witwatersrand Private Bag 3, Wits 2050, South Africa Tel (work) +27 (0)11 717 64 04 Tel (home) +27 (0)18 297 44 51 Fax +27 (0)18 299 24 64 Email sander@oomvanlieshout.net Web www.oomvanlieshout.net/sander ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.htmlReceived on Sat May 28 06:32:22 2005

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