[R] alternate usage of soil.texture (plotrix)

From: Dylan Beaudette <dylan.beaudette_at_gmail.com>
Date: Mon, 21 Jul 2008 07:00:09 -0700


Hi, I have used the soil.texture() function from the plotrix package many times and am very pleased that such a function exists in R. I have a slightly different need this time, and need some pointers on how to accomplish it. Instead of plotting single symbols on the triangle, I would like to outline and fill with a transparent color several textural classes. For example, if an area had both loam and sandy loam, I would like to draw a polygon around the entire loam and sandy loam classes.

Looking at the soil.texture() code, this snippet seems to draw the outlines of the texture classes. However, when I try plotting just a couple of the segments in these lists I get lines going off the original plot.

h1 <- c(85, 70, 80, 52, 52, 50, 20, 8, 52, 45, 45, 65,

            45, 20, 20)/100
        h3 <- c(0, 0, 20, 20, 7, 0, 0, 12, 20, 27, 27, 35, 40,
            27, 40)/100
        t1 <- c(90, 85, 52, 52, 43, 23, 8, 0, 45, 0, 45, 45,
            0, 20, 0)/100
        t3 <- c(10, 15, 20, 7, 7, 27, 12, 12, 27, 27, 55, 35,
            40, 40, 60)/100
        triax.segments(h1, h3, t1, t2, col.lines)


Apart from a purely manual approach using locator(), is there any way to accomplish what I am trying to do with a slight modification to soil.texture() ?

Thanks in advance.



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 21 Jul 2008 - 14:21:47 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 22 Jul 2008 - 13:32:06 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive