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POvalues not being copied to the next (local) environment?
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  1. POvalues not being copied to the next (local) environment?
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    copied!<p>Consider this output from <code>browser()</code> that is located inside <code>calcDistance</code>:</p> <pre><code>Called from: calcDistance(object = rst, xy = xy[[i]][j, ], effect.distance = effect.distance) Browse[1]&gt; ls.str() effect.distance : num 236 object : Formal class 'RasterLayer' [package "raster"] with 12 slots xy : Named num [1:2] -101.8 35.5 Browse[1]&gt; debugging in: xyValues(object = object, xy = xy, buffer = effect.distance) debug: standardGeneric("xyValues") Browse[2]&gt; ls.str() object : Formal class 'RasterLayer' [package "raster"] with 12 slots xy : Named num [1:2] -101.8 35.5 </code></pre> <p>Functions are as follows: simulationRun > createDistRaster > calcDistance > raster::xyValues. In the above output, you only see the last two. <code>xyValues</code> is from raster package.</p> <p>First paragraph of code shows that three objects are present: <code>effect.distance</code>, <code>object</code>, <code>xy</code>. In second paragraph, we descend into xyValues by calling debug(xyValues). In third paragraph we can see that <code>effect.distance</code> is missing.</p> <p>My question is: Even though <code>object</code> and <code>xy</code> seem to be copied to the <code>xyValues</code> environment just fine, <code>effect.distance</code> is not. How could this be explained?</p> <p>My sessionInfo()</p> <pre><code>R version 2.11.1 (2010-05-31) i386-pc-mingw32 locale: [1] LC_COLLATE=Slovenian_Slovenia.1250 LC_CTYPE=Slovenian_Slovenia.1250 [3] LC_MONETARY=Slovenian_Slovenia.1250 LC_NUMERIC=C [5] LC_TIME=Slovenian_Slovenia.1250 attached base packages: [1] splines stats graphics grDevices utils datasets methods [8] base other attached packages: [1] raster_1.3-11 foreach_1.3.0 codetools_0.2-2 iterators_1.0.3 [5] Hmisc_3.8-2 survival_2.35-8 spam_0.22-0 splancs_2.01-27 [9] sp_0.9-66 spatstat_1.20-2 deldir_0.0-12 mgcv_1.6-2 loaded via a namespace (and not attached): [1] cluster_1.12.3 grid_2.11.1 lattice_0.18-8 Matrix_0.999375-39 [5] nlme_3.1-96 tools_2.11.1 </code></pre>
 

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