TT.chemometrics.alr

divisorvar

css.names

Function that compute the additivelog-ratio transformation of compositional data (here texturedata). This a a copy-paste-and-rename of the alr function providedby the package chemometrics: P. Filzmoser and K. Varmuza (2008).chemometrics: Multivariate Statistical Analysis in Chemometrics.R package version 0.4.The function has been modified so it returns NA when a valueis below or equal to zero (this happens when using a regulargrid of texture data, for practical reasons).The function has also been modified so it uses column namerather than column index.

"The Soil Texture Wizard" is a set of R functions designed to produce texture triangles (also called texture plots, texture diagrams, texture ternary plots), classify and transform soil textures data. These functions virtually allows to plot any soil texture triangle (classification) into any triangle geometry (isosceles, right-angled triangles, etc.). This set of function is expected to be useful to people using soil textures data from different soil texture classification or different particle size systems. Many (> 15) texture triangles from all around the world are predefined in the package. A simple text based graphical user interface is provided: soiltexture_gui().

Julien MOEYS

soiltexture

Functions for Soil Texture Plot, Classification and
Transformation

Julien Moeys

Wei Shangguan

Rainer Petzold

Budiman Minasny

Bogdan Rosca

Nic Jelinski

Wiktor Zelazny

Rodolfo Marcondes Silva Souza

Jose Lucas Safanelli

Alexandre ten Caten

TT.chemometrics.alr function

<dl> <dt>X</dt>
<dd></dd>
 <dt>divisorvar</dt>
<dd></dd>
 <dt>css.names</dt>
<dd></dd>
</dl>

Arguments

Julien Moeys [aut, cre], Wei Shangguan [ctb], Rainer Petzold [ctb], Budiman Minasny [ctb], Bogdan Rosca [ctb], Nic Jelinski [ctb], Wiktor Zelazny [ctb], Rodolfo Marcondes Silva Souza [ctb], Jose Lucas Safanelli [ctb], Alexandre ten Caten [ctb]

Author

Function that compute the additive

log-ratio transformation of compositional data (here texture

data). This a a copy-paste-and-rename of the alr function provided

by the package chemometrics: P. Filzmoser and K. Varmuza (2008).

chemometrics: Multivariate Statistical Analysis in Chemometrics.

R package version 0.4.

The function has been modified so it returns NA when a value

is below or equal to zero (this happens when using a regular

grid of texture data, for practical reasons).

The function has also been modified so it uses column name

rather than column index.

Compute the additive log-ratio transformation of compositional data. — TT.chemometrics.alr

<dl>



 <dt>X</dt>
<dd>


</dd>



 <dt>divisorvar</dt>
<dd>


</dd>



 <dt>css.names</dt>
<dd>


</dd>



</dl>

TT.chemometrics.alr: Compute the additive log-ratio transformation of compositional data.

Description

Usage

Arguments

Author