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POFinding What You Need in R: focused searching within R and all (3,500+) CRAN Packages
 

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    <p>Often in R, there are a dozen functions scattered across as many packages--all of which have the same purpose but of course differ in accuracy, performance, documentation, theoretical rigor, and so on.</p> <p>How do you locate these--from within R and even from among the CRAN Packages which you have not installed?</p> <p>So for instance: the generic <strong><em>plot</em></strong> function. Setting secondary ticks is much easier using a function <strong>outside</strong> of the base package:</p> <pre><code>minor.tick(nx=n, ny=n, tick.ratio=n) </code></pre> <p>Of course <em>plot</em> is in R core, but <em>minor.tick</em> is not, it's actually in <em>Hmisc</em>. </p> <p>Of course, that doesn't show up in the documentation for <em>plot</em>, nor should you expect it to. </p> <p>Another example: data-input arguments to <em>plot</em> can be supplied by an object returned from the function <em>hexbin</em>, again, this function is from a library <em>outside</em> of R core.</p> <p>What would be great obviously is a programmatic way to gather these function arguments from the various libraries and put them in a single namespace?</p> <p>*edit: (trying to re-state my example just above more clearly:) the arguments to <em>plot</em> supplied in R core, e.g., setting the axis tick frequency are xaxp/yaxp; however, one can also set a/t/f via a function outside of the base package, again, as in the minor.tick function from the Hmisc package--but you wouldn't know that just from looking at the plot method signature. Is there a meta function in R for this?*</p> <p>So far, as i come across them, i've been manually gathering them, each set gathered in a single <em>TextMate</em> <em>snippet</em> (along with the attendant library imports). This isn't that difficult or time consuming, but i can only update my snippet as i find out about these additional arguments/parameters. Is there a canonical R way to do this, or at least an easier way?</p> <p>Just in case that wasn't clear, i am not talking about the case where multiple packages provide functions directed to the same statistic or view (e.g., 'boxplot' in the base package; 'boxplot.matrix' in gplots; and 'bplots' in Rlab). What i am talking is the case in which the function name is the same across two or more packages.</p>
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