subset,SoilProfileCollection-method

subset

<code><a href="/link/subset()?package=aqp&version=2.1.0" data-mini-rdoc="aqp::subset()">subset()</a></code> is a function used for extracting profiles from a SoilProfileCollection based on logical criteria. It allows the user to specify an arbitrary number of logical vectors (equal in length to site or horizon), separated by commas. The function includes some support for non-standard evaluation.

The Algorithms for Quantitative Pedology (AQP) project was started in 2009 to organize a loosely-related set of concepts and source code on the topic of soil profile visualization, aggregation, and classification into this package (aqp). Over the past 8 years, the project has grown into a suite of related R packages that enhance and simplify the quantitative analysis of soil profile data. Central to the AQP project is a new vocabulary of specialized functions and data structures that can accommodate the inherent complexity of soil profile information; freeing the scientist to focus on ideas rather than boilerplate data processing tasks <doi:10.1016/j.cageo.2012.10.020>. These functions and data structures have been extensively tested and documented, applied to projects involving hundreds of thousands of soil profiles, and deeply integrated into widely used tools such as SoilWeb <https://casoilresource.lawr.ucdavis.edu/soilweb-apps>. Components of the AQP project (aqp, soilDB, sharpshootR, soilReports packages) serve an important role in routine data analysis within the USDA-NRCS Soil Science Division. The AQP suite of R packages offer a convenient platform for bridging the gap between pedometric theory and practice.

Dylan Beaudette

Algorithms for Quantitative Pedology

Pierre Roudier

Andrew Brown

subset,SoilProfileCollection-method function

<dl><dt>x</dt>
<dd>A SoilProfileCollection</dd>
<dt>...</dt>
<dd>Comma-separated set of R expressions that evaluate as TRUE or FALSE. Length for individual expressions matches number of sites OR number of horizons, in <code>object</code>.</dd>
<dt>greedy</dt>
<dd>Use "greedy" matching for combination of site and horizon level matches? <code>greedy = TRUE</code> is the union, whereas <code>greedy = FALSE</code> (default) is the intersection (of site and horizon matches).</dd></dl>

Arguments

Author

<code><a href='https://rdrr.io/r/base/subset.html'>subset()</a></code> is a function used for extracting profiles from a SoilProfileCollection based on logical criteria. It allows the user to specify an arbitrary number of logical vectors (equal in length to site or horizon), separated by commas. The function includes some support for non-standard evaluation.

Subset a SoilProfileCollection with logical expressions — subset,SoilProfileCollection-method

<dl>

<dt>x</dt>
<dd>A SoilProfileCollection</dd>


<dt>...</dt>
<dd>Comma-separated set of R expressions that evaluate as TRUE or FALSE. Length for individual expressions matches number of sites OR number of horizons, in <code>object</code>.</dd>


<dt>greedy</dt>
<dd>Use "greedy" matching for combination of site and horizon level matches? <code>greedy = TRUE</code> is the union, whereas <code>greedy = FALSE</code> (default) is the intersection (of site and horizon matches).</dd>

</dl>

subset,SoilProfileCollection-method: Subset a SoilProfileCollection with logical expressions

Description

Usage

Value

Arguments

Author

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