Barycentric plots
Function to add a grid to an existing (barycentric) plot.
trigrid(x = seq(0.1, 0.9, by = 0.1), y = NULL, z = NULL,
lty = "dashed", col = "grey", ...)x |
Values along which to draw grid lines for first dimension
(or all dimensions if |
y |
Grid lines for second dimension. |
z |
Grid lines for third dimension. |
lty |
Line type (see |
col |
Line colour (see |
... |
Further graphical parameters passed to |
Grid lines illustrate the set of points for which one of the dimensions is held constant; e.g. horizontal lines contain all points with a certain value y for the second dimension, connecting the two extreme points (0,y,1-y) and (1-y,y,0).
Grids may be designed more flexible than with triplot's grid option.
Christian Röver, roever@statistik.tu-dortmund.de
triplot(grid = FALSE) trigrid(c(1/3, 0.5)) # same grid for all 3 dimensions triplot(grid = c(1/3, 0.5)) # (same effect) triplot(grid = FALSE) # different grids for all dimensions: trigrid(x = 1/3, y = 0.5, z = seq(0.2, 0.8, by=0.2)) triplot(grid = FALSE) # grid for third dimension only: trigrid(x = NA, y = NA, z = c(0.1, 0.2, 0.4, 0.8))
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