On Thu, 28 Sep 2006, Frank Hardisty wrote: > Dear Jacques Vernin (and All), > > I appreciate that you are experiencing some difficulties when using R > and spatial extensions. > > However, please realize that Roger Bivand has been wonderfully patient > and helpful to many, many people, as you can see in the history of > this email list. > > Please remember that R and R spatial extensions are written, > maintained, and supported by volunteer labor.
Thanks for your kind words, Frank! But in fact at least one of my replies to Jacques was brusque, I can get annoyed when people do not follow general R list advice and state their platform and package versions. So his choice of tone is partly my choice. The resolution here is that overloading existing functions is *not a good idea* and can lead to unexpected consequences, like this method dispatching muddle. Using the package framework and guarding the local code in a namespace should solve it. Roger PS. I had a very interesting talk at FOSS4G with someone attacking the spatial R/Java puzzle through JRI (see the rJava package), who reported much more success than we had two years ago. > > Your email "tone of voice" is not very sweet, considering that you are > asking for free help. > > regards, > -Frank Hardisty > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Frank Hardisty > Department of Geography > University of South Carolina > [EMAIL PROTECTED] > Office -- 803-777-5729 > Fax -- 803-777-4972 > http://people.cas.sc.edu/hardistf/ > > > On 9/28/06, Frank Hardisty <[EMAIL PROTECTED]> wrote: > > > > > > ---------- Forwarded message ---------- > > From: "pir2.jv" <[EMAIL PROTECTED]> > > To: [EMAIL PROTECTED] > > Date: Thu, 28 Sep 2006 16:42:13 +0200 > > Subject: Re: [R-sig-Geo] (no subject) > > > > Le 28 sept. 06 à 16:18, Roger Bivand a écrit : > > > > >>> > > >>> If you say ls(), do the names of any of the objects begin with plot? > > >> > > >>> ls(pat="plot") > > >> [1] "BBplot" "Bplot" "draw.plotmath.cell" > > >> [4] "plot" "plotG" "plotM" > > >> [7] "plotx" "plotxx" > > >> > > >> plotx, plotxx, plotG and plotM are functions of mine. Is there a > > >> problem ? > > > > > > The problem is that your local function plot is masking the one which > > > understands that "SpatialPolygons" objects have their own method > > > and need > > > to be sent there, so yes, at least your local plot is the problem. The > > > standard advice if you have a number of functions is to write a > > > package > > > with a NAMESPACE, and that will protect you from R not choosing the > > > one > > > you intended. > > > > > Why would be my function plot local ? It is not. > > I removed the others > > > > ============ > > > plot > > function (x, y, ...) > > { > > if (is.null(attr(x, "class")) && is.function(x)) { > > nms <- names(list(...)) > > if (missing(y)) > > y <- { > > if (!"from" %in% nms) > > 0 > > else if (!"to" %in% nms) > > 1 > > else if (!"xlim" %in% nms) > > NULL > > } > > if ("ylab" %in% nms) > > plot.function(x, y, ...) > > else plot.function(x, y, ylab = paste(deparse(substitute(x)), > > "(x)"), ...) > > } > > else UseMethod("plot") > > } > > <environment: namespace:graphics> > > > > ============================= > > > > > > > > > > Jacques Vernin > > > > _______________________________________________ > > R-sig-Geo mailing list > > [email protected] > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > > > > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
