>>>>> "Duncan" == Duncan Murdoch <[EMAIL PROTECTED]>
>>>>> on Tue, 27 Jun 2006 08:58:59 -0400 writes:
Duncan> On 6/27/2006 8:40 AM, Gabor Grothendieck wrote:
>> On 6/27/06, Martin Maechler <[EMAIL PROTECTED]> wrote:
>>> >>>>> "Gabor" == Gabor Grothendieck <[EMAIL PROTECTED]>
>>> >>>>> on Mon, 26 Jun 2006 11:28:48 -0400 writes:
>>>
Gabor> I think its often the case that one has 3 tuples and does not know
Gabor> how to use contour with that; so, it would be nice if the contour
Gabor> help page gave advice and an example and a pointer to the relevant
Gabor> functions if it cannot be done by contour.
>>>
>>> Yes, but even more importantly,
>>> what help(contour) should really have is a
\code{\link[lattice]{contourplot}}
>>> since contourplot() from package 'lattice'
>>> can deal well excellently with the situation Ajay has:
>>>
Duncan> [ deletions ]
>> Or perhaps contour should be extended so that it can handle triples
>> giving the capability directly in base graphics. I think that that is
what
>> many people really expect.
Duncan> The problem here is that most users are happy enough
Duncan> with the akima or contourplot implementations, so
Duncan> there isn't much motivation to spend several hours
Duncan> doing the necessary work. But if you want to
Duncan> contribute this, please do.
But also consider that --- since the beginning of time or so ---
the triad of
contour(), image(), and persp()
have had an (almost?) identical way of dealing with (x,y,z)
{and related arguments}.
So we would want a change using a helper function that
can be used in all three cases {and BTW, that helper function
would use xyz.coords() - similarly to what happens in
scatterplot3d() {in the pkg of the same name}.
Duncan> Be careful about where you get the code: the interp
Duncan> implementation in akima is not licensed freely
Duncan> enough to be included in R ("no commercial
Duncan> use"). The one in lattice is GPL'd, so it should be
Duncan> fine.
and I agree that making that functionality part of ``base R''
(would be package 'grDevices') is something quite desirable.
Reiterating Duncan: Contributions are welcome, particularly if
they are patches against R-devel (and contain updated help files).
Duncan> Duncan Murdoch
Martin Maechler
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