[R] lattice contourplots

[ivo welch]

thank you.  yes, I got bitten by "FAQ 7.22: Why do lattice/trellis
graphics not work?"  It had never occurred to me that this could be
expected behavior or a FAQ.  (didn't show up in a google search for
contourplot.)  Unless one knows, this is a puzzler.  Thanks for the
pointer.  so, a minimum working example is

    require(lattice)
    d <- data.frame( expand.grid( x = seq(0,6,length.out=100), y =
seq(0,6,length.out=100) ) )
    d <- within(d, z <- sin( (x+y) ))
    xx <- contourplot( z ~ x * y, data = d)
    print(xx)  ## necessary in source code, but not in interactive mode

regards, /iaw


----
Ivo Welch (ivo.welch at gmail.com)
http://www.ivo-welch.info/
J. Fred Weston Professor of Finance
Anderson School at UCLA, C519
Director, UCLA Anderson Fink Center for Finance and Investments
Free Finance Textbook, http://book.ivo-welch.info/
Editor, Critical Finance Review, http://www.critical-finance-review.org/



On Mon, Jun 1, 2015 at 1:29 PM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
> The help for for contourplot answers this question in the description of the formula (x) argument.
> ---------------------------------------------------------------------------
> 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 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?
>>---------------------------------------------------------------------------
>>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
>>---------------------------------------------------------------------------
>>
>>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/
>>>
>>>______________________________________________
>>>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.
>>
>>______________________________________________
>>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.
>