Triangle plot
Display a triangle plot with optional grid.
triax.plot(x=NULL,main="",at=seq(0.1,0.9,by=0.1),
axis.labels=NULL,tick.labels=NULL,col.axis="black",cex.axis=1,
cex.ticks=1,
align.labels=TRUE,show.grid=FALSE,col.grid="gray",lty.grid=par("lty"),
cc.axes=FALSE,show.legend=FALSE,label.points=FALSE,point.labels=NULL,
col.symbols="black",pch=par("pch"),mar=c(5,2,4,2),no.add=TRUE,...)x |
Matrix where each row is three proportions or percentages that must sum to 1 or 100 respectively. |
main |
The title of the triangle plot. Defaults to nothing. |
at |
The tick positions on the three axes. |
axis.labels |
Labels for the three axes in the order left, right, bottom. Defaults to the column names. |
tick.labels |
The tick labels for the three axes as a list with three components l, r and b (left, right and bottom). Defaults to argument at (proportions). |
col.axis |
Color of the triangular axes, ticks and labels. |
cex.axis |
Character expansion for axis labels. |
cex.ticks |
Character expansion for the tick labels. |
align.labels |
Logical - whether to align axis and tick labels with the axes. |
show.grid |
Whether to display grid lines at the ticks. |
col.grid |
Color of the grid lines. Defaults to gray. |
lty.grid |
Type of line for the grid. |
cc.axes |
Whether axes and axis ticks should be clockwise or counterclockwise. |
show.legend |
Logical - whether to display a legend. |
label.points |
Logical - whether to call thigmophobe.labels to label the points. |
point.labels |
Optional labels for the points and/or legend. |
col.symbols |
Color of the symbols representing each value. |
pch |
Symbols to use in plotting values. |
mar |
Margins for the triangle plot. |
no.add |
Whether to restore the previous plotting parameters (TRUE) or leave them, allowing more points to be added. |
... |
Additional arguments passed to points. |
triax.plot displays a triangular plot area on which proportions or percentages are displayed. A grid or legend may also be displayed.
A list containing xypos (the x,y positions plotted) and oldpar (the plotting parameters at the time triax.plot was called).
A three axis plot can only properly display one or more sets of three proportions that each sum to 1 (or percentages that sum to 100). Other values may be scaled to proportions (or percentages), but unless each set of three sums to 1 (or 100), they will not plot properly and triax.points will complain appropriately. Note also that triax.plot will only display properly in a square plot, which is forced by par(pty="s").
In case the user does want to plot values with different sums, the axis tick labels can be set to different ranges to accomodate this. triax.points will still complain, but it will plot the values.
If planning to add points with triax.points call triax.plot with no.add=FALSE and restore plotting parameters after the points are added.
Jim Lemon - thanks to Ben Daughtry for the info on counterclockwise axes.
data(soils) triax.plot(soils[1:10,],main="DEFAULT") triax.plot(soils[1:10,],main="PERCENTAGES (Counterclockwise axes)", tick.labels=list(l=seq(10,90,by=10),r=seq(10,90,by=10),b=seq(10,90,by=10)), pch=3,cc.axes=TRUE) triax.return<-triax.plot(soils[1:6,],main="GRID AND LEGEND", show.grid=TRUE,show.legend=TRUE,col.symbols=1:6,pch=4) # triax.plot changes a few parameters par(triax.return$oldpar)
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