[R] xyplot with lowess curves

[Sundar Dorai-Raj]

Does this do what you want? The "panel" argument has the custom pane
function I referred to before.

Col <- c("red", "green", "blue", "purple")
xyplot (
 SnowLineElevation ~ Year | Model,
 data = d,
 panel = function(x, y, col, ...) {
   Col <- Col[panel.number()]
   panel.xyplot(x, y, col = "blue", ...)
   panel.loess(x, y, col = Col)
 },
 ylim = c(0,100),
 type = c('p','smooth'),
 col = 'blue',
 pch = 21,
 xlab = 'Year',
 ylab = 'Snowline Elevation [m]'
)

On Mon, Feb 2, 2009 at 12:18 PM, Hutchinson,David [PYR]
<David.Hutchinson at ec.gc.ca> wrote:
> I haven't had much luck with a custom panel function; mainly because I
> don't truly understand how to embedd the functionality into the xyplot
> command.
>
> Here's a reproducible example if you can help out.
>
> Thanks,
> Dave
>
> library (lattice)
>
> d <- NULL
> models <- c('A','B','C','D')
> n = 100
> for (i in seq(along = models)){
>  d <- rbind(
>    d, data.frame (
>      Model = models[i],
>      Year = seq(1960, length.out=n, by = 1),
>      SnowLineElevation = runif(n, 0, 100)
>    )
>  )
> }
>
> xyplot (
>  SnowLineElevation ~ Year | Model,
>  data = d,
>  ylim = c(0,100),
>  type = c('p','smooth'),
>  col = 'blue',
>  pch = 21,
>  xlab = 'Year',
>  ylab = 'Snowline Elevation [m]'
> )
>
> -----Original Message-----
> From: Sundar Dorai-Raj [mailto:sdorairaj at gmail.com]
> Sent: Monday, February 02, 2009 11:43 AM
> To: Hutchinson,David [PYR]
> Cc: r-help at r-project.org
> Subject: Re: [R] xyplot with lowess curves
>
> You'll need a custom panel function. It would also help if you provided
> a reproducible example:
>
> xyplot (
>  SnowLineElevation ~ Year | Model,
>  data = data,
>  panel = function(x, y, col, ...) {
>    col <- ifelse(panel.number() == 1, "red", "green")
>    panel.xyplot(x, y, col = "blue", ...)
>    panel.loess(x, y, col = col)
>  },
>  ylim = c(0,1800),
>  pch = 21,
>  xlab = 'Year',
>  ylab = 'Snowline Elevation [m]'
> )
>
> Alternatively, you can use the group argument in conjunction with the
> panels:
>
> xyplot(SnowLineElevation ~ Year | Model, data, groups = Model, type =
> c("p", "smooth"))
>
> if you want the points and the lines to be the same color.
>
> --sundar
>
> On Mon, Feb 2, 2009 at 10:20 AM, Hutchinson,David [PYR]
> <David.Hutchinson at ec.gc.ca> wrote:
>> I am trying to change the attributes of the lowess lines fit to an
>> xyplot command, but have been unsuccessful in my search of the online
>> help. Right now, both the points and lowess line come out in the same
>> color (blue). I am unsure how I can change the properties of the
>> lowess line separately.
>>
>> xyplot (
>>  SnowLineElevation ~ Year | Model,
>>  data = data,
>>  ylim = c(0,1800),
>>  type = c('p','smooth'),
>>  col = 'blue',
>>  pch = 21,
>>  xlab = 'Year',
>>  ylab = 'Snowline Elevation [m]'
>> )
>>
>> Any help would be much appreciated,
>>
>> Dave
>>
>>        [[alternative HTML version deleted]]
>>
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>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>