From macq at llnl.gov  Wed May 10 22:58:38 2006
From: macq at llnl.gov (Don MacQueen)
Date: Wed, 10 May 2006 13:58:38 -0700
Subject: [Rd] RFC:  log='z' for image, contour, persp?
In-Reply-To: <44611A85.8090605@stats.uwo.ca>
References: <44611A85.8090605@stats.uwo.ca>
Message-ID: <p06210208c08804458f78@[128.115.153.6]>

Yes, it does. I've needed it more often than not.
-Don

At 6:41 PM -0400 5/9/06, Duncan Murdoch wrote:
>I've been thinking of adding the possibility of including "z" among the
>axes to be logged in image, contour, and persp.  In the first two, it
>would only affect where the breaks were set if they are calculated
>automatically; it would have a bigger effect in persp.
>
>For example,
>
>image(x, y, z, log="z")
>
>would set 12 colours evenly spaced on a log scale of the z values.  (12
>because that's the default).
>
>We already support
>
>image(x, y, z, log="x")
>
>to scale the x axis (though there's a spurious warning; I'll fix that).
>
>image(z, log="x")
>
>fails because it tries to take a log of zero.
>
>Does it seem like a good idea for these 3D functions to support log="z"
>the way 2D functions do?
>
>Duncan Murdoch
>
>______________________________________________
>R-devel at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-devel


-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA



[Rd] RFC: log='z' for image, contour, persp?
Don MacQueen