Dear R (3.2.0, osx) experts: I would like to create contourplots from
irregular data frames (i.e., not a matrix on a grid). I am getting
inconsistent results from lattice contourplot(). sometimes it works
(quartz plot on contours), sometimes it doesn't (blank plot = nada).
I have tried variations from
http://stackoverflow.com/questions/10805093/contour-plot-from-data-frame
, but I do not understand the problem here. contourplot gives no
error messages.
an example is
require(lattice)
d <- data.frame( x = (1:30 + rnorm(30)), y = (1:30 + rnorm(30)) )
d <- within(d, z <- sin(x+y))
quartz()
contourplot( z ~ x * y, data = d)
am I committing an error, or is there something more robust or at
least verbose, perhaps?
help appreciated. /iaw
----
Ivo Welch (ivo.we...@gmail.com)
http://www.ivo-welch.info/
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