rysgran (version 1.1)

shepard.plot: Generates the Structure of Shepard Ternary Diagram

Description

Generates the structure of Shepard ternary diagram to be used by rysgran.ternary function

Usage

shepard.plot(x = x, lang = lang, axis.labels = axis.labels,
    show.names = show.names, show.lines = show.lines, 
    show.legend = show.legend, show.grid = show.grid, 
    cex.axis = cex.axis, cex.names = cex.names,
    col.labels = col.labels, col.axis = col.axis,
    col.names = col.names, col.lines = col.lines,
    col.grid = col.grid, lty.grid = par("lty"))

Arguments

x

a 3 columns matrix with percentages of Sand, Silt and Clay which should be passed by class.percent function. The sum of each row must be 100 or 1, otherwise there may be distortions in the position of

lang

language . Should be english ("en-US", "en-GR", "eng", "e"), or portuguese ("pt-BR", "pt-PT", "port", "p"). The default is "en-US"

axis.labels

vector of length 3 with the soil textures names. If NULL the names are taken from the matrix of percentages. Default is NULL

show.names

logical. If TRUE the textural classes names will show up in the ternary diagram. Should be used with the argument show.legend. Default is TRUE

show.lines

logical. If TRUE the lines that separate the textural classes are displayed. Default is TRUE

show.legend

logical. If TRUE the legend of textural classes are displayed in the top left. Should be used with the argument show.names. Default is TRUE

show.grid

logical. If TRUE display grid lines in the ternary diagram. Default is FALSE

cex.axis

character expansion for axis labels. Default is "1"

cex.names

character size of text of textural classes text which composes the ternary diagram. Default is "1"

col.labels

text color of labels. Default is "black"

col.axis

text color of axis labels. Default is "black"

col.names

text color of textural classes which composes the ternary diagram if the argument show.names is TRUE. Default is "gray"

col.lines

color of lines that separate the textural classes case the argument show.lines is TRUE. Default is "black"

col.grid

color of grid lines case the argument show.grid is TRUE. Default is "gray"

lty.grid

type of grid line case the argument show.grid is TRUE. Default is "3"

Value

• a triangular plot which is passed to rysgran.ternary function

Details

The arguments are passed by the rysgran.ternary function. To generate the Shepard ternary diagram in the rysgran.ternary function the user must set the 'method' argument to "shepard"

References

- Shepard, F. P. (1954) Nomenclature based on sand-silt-clay ratios. Journal Sedimentary Petrology, 24:151--158.

See Also

gran.stats , class.percent , rysgran.ternary , rysgran.hist ,rysgran.plot

Examples

#Shepard ternary diagram
library(rysgran)
data(camargo2001)
tab<-camargo2001
percent <- class.percent(tab, mode="total")
rysgran.ternary  (x = percent[2:4], method = "shepard")