[R] lattice contourplots

[Jeff Newmiller]

The help for for contourplot answers this question in the description of the formula (x) argument.
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Sent from my phone. Please excuse my brevity.

On June 1, 2015 7:02:00 AM EDT, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
>What does quartz() have to do with this? If quartz is the problem,
>R-sig-mac would be a better place to ask. Or are you being bitten by R
>FAQ 7.22?
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>Jeff Newmiller                        The     .....       .....  Go
>Live...
>DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
>Go...
>                                     Live:   OO#.. Dead: OO#..  Playing
>Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
>/Software/Embedded Controllers)               .OO#.       .OO#. 
>rocks...1k
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>
>Sent from my phone. Please excuse my brevity.
>
>On June 1, 2015 6:24:18 AM EDT, ivo welch <ivo.welch at gmail.com> wrote:
>>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.welch at gmail.com)
>>http://www.ivo-welch.info/
>>
>>______________________________________________
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>>and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.