R-beta: image

Friedrich Leisch Friedrich.Leisch at ci.tuwien.ac.at
Thu Jan 8 16:42:58 CET 1998

>>>>> On Wed, 7 Jan 1998 16:40:53 -0600 (CST),
>>>>> Bill Simpson (BS) wrote:

BS> Questions on image:
BS> 1) How can I put labels on the x and y axes?

As usually using the xlab and ylab arguments (same as plot)

BS> 2) How to tell it to use e.g. 32 grey levels (not some colour
BS> map)?

col = gray(1:32/32)

see also the help page of gray

BS> 3) How to know what the legend is (i.e. each grey level = what z value)?

I'm not cpmpletely sure, but I think min(z) will be the first color
(or grey-level), max(z) the last grey-level and the rest will be
equally spaced in between.

BS> BTW I was wondering if persp was on the To Do list. That would be great!

It most certainly is ... most of us would like to have it ...


                        Friedrich  Leisch                             
Institut für Statistik                      Tel: (+43 1) 58801 4541
Technische Universität Wien                 Fax: (+43 1)  504 14 98
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