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
R-sig-Geo@stat.math.ethz.ch
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
