Hello David:

Thanks for your response.

I am not sure, but isn't an ordered categorical variable integer for all
practical purposes? (R < L)

Further, the problem persists if I change 'at' from seq(-0.3, 0.3, length =
20) to seq(-0.3, 0.3, length = 50;  I think this argument is for the color
key limits.

Best,
Sanvesh


On Sun, Jul 6, 2014 at 11:59 PM, David Winsemius <dwinsemius@comcast.net>
wrote:

>
> On Jul 6, 2014, at 4:35 PM, Sunny Srivastava wrote:
>
> > Hello R-helpers:
> >
> > I think there is some problem with my code, but I would like to seek you
> > help because I can't spot it.
> >
> > I have a data.frame defined as follows:
> >
> > testdf <- structure(list(yy = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
> > 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("R", "L"), class =
> c("ordered",
> > "factor")),
> >                         xx = c(8L, 44L, 45L, 46L, 47L, 48L, 49L, 50L,
> 32L,
> > 33L, 34L, 37L, 38L, 44L, 47L, 48L),
> >                         zz = c(-0.0509470162236187, -0.127284016213917,
> > -0.148955671035087, -0.142907338502986, -0.160948815798959,
> > -0.173350477727937, -0.161083124553469,
> >                             -0.14273409035068, -0.0214438692797626,
> > -0.0628618704957434, -0.0877747107755074, -0.0948371137126557,
> > -0.0659475583478307, -0.0601482978919971,
> >                             -0.0339547824620206, -0.0433516197870341)),
> >                    .Names = c("yy", "xx", "zz"),
> >                    row.names = c("25", "26", "27", "28", "29", "210",
> > "211", "212", "213", "214", "215", "216", "217", "218", "219", "220"),
> > class = "data.frame")
> >
> > I would like to see a 'levelplot'  of yy vs xx, but the value of xx
> creates
> > problem in the distribution of colors.  I am guessing it is due to the
> > value of xx = 8.  The levelplot below seems to be fine.
>
> I think the fundamental problem is that you are trying to use levelplot
> with a categorical variable on the RHS of the formula. That is NOT what is
> expected. You are the one who expanded the X range to c(0,50) and the color
> range to seq(-0.3, 0.3, length = 20).
>
> --
> David.
> >
> > library(latticeExtra)
> >
> >
> > ## ok; note the subset argument!
> > levelplot(zz ~ xx + yy, testdf, par.settings = custom.theme.2(), subset =
> > xx != 8,
> >          scales = list(x = list(cex = 0.5, rot=90), y = list(cex = 0.5),
> > alternating = FALSE),
> >          xlim = c(0, 50),
> >          at = seq(-0.3, 0.3, length = 20),
> >          panel = function(x, y, z, ...) {
> >              panel.levelplot(x, y, z,...)
> >          },
> >          colorkey=list(labels = list(cex = 1.5))
> >          )
> >
> > If I remove the subsetting of xx != 8, then the distribution of colors is
> > wrong.  Specifically, it ranges from xx =1 to 20 for y = R, which is
> > incorrect.  What am I missing here?  Note that using the default color
> > scheme has no effect.
> >
> > ## seems to be a bug ? see xx = 1 to 20; note that the subset argument is
> > removed
> > levelplot(zz ~ xx + yy, testdf, par.settings = custom.theme.2(),
> >          scales = list(x = list(cex = 0.5, rot=90), y = list(cex = 0.5),
> > alternating = FALSE),
> >          xlim = c(0, 50),
> >          at = seq(-0.3, 0.3, length = 20),
> >          panel = function(x, y, z, ...) {
> >              panel.levelplot(x, y, z,...)
> >          },
> >          colorkey=list(labels = list(cex = 1.5))
> >          )
> >
> >
> > Thanks,
> > S.
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > 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.
>
> David Winsemius
> Alameda, CA, USA
>
>

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