On 7 Aug 2003, Tito de Morais Luis wrote:
> Dear listers,
>
> I loaded a pixmap image with:
> brobo <- read.pnm("brobo.pnm")
>
> I can have the characteristics of the image with:
> > brobo
> Pixmap image
> Type : pixmapRGB
> Size : 609x682
> Resolution : 1x1
> Bounding box : 0 0 682 609
>
> How can I retrieve the image size ?
> nrow(brobo) and ncol(brobo) give NULL
> getClass("pixmap")
Slots:
Name: size cellres bbox bbcent
Class: integer numeric numeric logical
Known Subclasses: "pixmapChannels", "pixmapIndexed",
"pixmapGrey",
"pixmapRGB"
brobo at size, to get the equivalent of dim(), nrow is brobo at size[1], ncol
brobo at size[2], or:
setGeneric("nrow", function(x) standardGeneric("nrow"))
setMethod("nrow", "pixmap", function(x) { x at size[1] })
gets you there.
Roger
>
> I succeeded using:
>
> > nrow(getChannels(brobo))
> [1] 609
> > ncol(getChannels(brobo))
> [1] 682
>
> It looks a bit tricky, is there another way ?
>
> Thanks in advance,
>
> Tito
>
> Running Mandrake 9.1
>
> > version
> _
> platform i686-pc-linux-gnu
> arch i686
> os linux-gnu
> system i686, linux-gnu
> status
> major 1
> minor 7.1
> year 2003
> month 06
> day 16
> language R
>
>
>
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no