(Too trivial for the list)
I debated saying something similar but decided not to, as polygons can
be drawn e.g. via panel.polygon.
Cheers,
Bert
On Mon, May 1, 2017 at 8:25 AM, Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote:
> It is not a question of whether lattice "understands" the unsorted data...
> imagine trying to plot 4 points to form a square instead of a trend line...
> you would NOT want lattice to sort those points for you. That lattice leaves
> your data alone gives you more flexibility, even while it adds work for
> certain applications.
>
> --
> Sent from my phone. Please excuse my brevity.
>
> On May 1, 2017 7:34:09 AM PDT, Bert Gunter <bgunter.4...@gmail.com> wrote:
>>Yes. type = "l" connects the points in the order given in the data, so
>>if the x's are not already ordered, the plots will be different after
>>ordering the x's.
>>
>>e.g.
>>
>>> x <- c(3,1,2,4,6,5)
>>> y <- 11:16
>>> xyplot(y~x. type = "l")
>>
>>
>>As for why ... that's just the way it was designed. You can always
>>order the data first, if you don't want this default.
>>
>>Cheers,
>>Bert
>>
>>Bert Gunter
>>
>>"The trouble with having an open mind is that people keep coming along
>>and sticking things into it."
>>-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>
>>
>>On Sun, Apr 30, 2017 at 6:07 PM, array chip via R-help
>><r-help@r-project.org> wrote:
>>> Dear all, I am new to lattice, so would appreciate anyone's help on
>>the questions below. I am using xyplot to plot some trend in my
>>dataset. Using the example dataset attached, I am trying to plot
>>variable "y" over variable "time" for each subject "id":
>>> dat<-read.table("dat.txt",sep='\t',header=T,row.names=NULL)
>>> xyplot(y ~ time, data=dat, groups=id, aspect = "fill", type = c("p",
>>"l"), xlab = "Time", ylab = "Y")
>>>
>>> It appears that it just worked fine. But if I sort the "dat" first,
>>the plot will look somewhat different!
>>> dat<-dat[order(dat$id, dat$time),]xyplot(y ~ time, data=dat,
>>groups=id, aspect = "fill", type = c("p", "l"), xlab = "Time", ylab =
>>"Y")
>>> Why is that? Do you need to sort the data first before using xyplot?
>>Why xyplot can not understand the dataset unless it is sorted first?
>>> Thanks,
>>> John
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>>
>>______________________________________________
>>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>>PLEASE do read the posting guide
>>http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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