[R] adding a line across plots in xy plot with panel.abline

[Bert Gunter]

You misspelled panel.abline as panel.labline in your code you included
here. If that's the real code, that's why.

-- Bert



Bert Gunter

"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
   -- Clifford Stoll


On Sun, Sep 13, 2015 at 8:43 PM, Christine Lee via R-help
<r-help at r-project.org> wrote:
> Dear all,
>
> I want to draw a line at DI=1 across all four graphs in the xy plot, I have used panel.abline, but I failed to do so, does any one has an idea of what has went wrong?
>
> structure(list(Date = structure(c(6L, 7L, 2L, 4L, 13L, 17L, 5L,
> 12L, 4L, 11L, 14L, 9L, 7L, 2L, 4L, 13L, 10L, 17L, 5L, 12L, 8L,
> 4L, 11L, 14L, 9L, 16L, 15L, 3L, 10L, 1L, 17L, 5L, 12L, 8L, 4L,
> 11L, 14L, 12L, 8L, 4L, 11L, 14L), .Label = c("1/10", "1/11",
> "11/11", "12/11", "13/10", "19/9", "2/10", "2/11", "20/9", "23/9",
> "26/11", "29/10", "29/11", "30/11", "31/10", "4/10", "6/10"), class = "factor"),
>     Year = structure(c(1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L,
>     2L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L,
>     1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
>     2L, 2L), .Label = c("Y2002", "Y2014"), class = "factor"),
>     Station = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
>     1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
>     3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 4L, 4L,
>     4L, 4L, 4L), .Label = c("E", "F", "H", "I"), class = "factor"),
>     DI = c(13.4, 7, 12.6, 12.6, 5.2, 2.2, 1, 1, 1.2, 0.8, 2.3,
>     3.8, 5.4, 4.6, 5, 3.2, 3.1, 8.7, 2.1, 2.7, 4.9, 4, 2.2, 5.3,
>     5.6, 4.8, 4, 8.6, 1.9, 2.9, 5.9, 2.6, 8.9, 4, 13.5, 15.3,
>     12.8, 3.4, 4.7, 1.7, 0.9, 1.7), Date1 = structure(c(16697,
>     16710, 16740, 16751, 16768, 16714, 16721, 16737, 16751, 16765,
>     16769, 16698, 16710, 16740, 16751, 16768, 16701, 16714, 16721,
>     16737, 16741, 16751, 16765, 16769, 16698, 16712, 16739, 16750,
>     16701, 16709, 16714, 16721, 16737, 16741, 16751, 16765, 16769,
>     16737, 16741, 16751, 16765, 16769), class = "Date")), .Names = c("Date",
> "Year", "Station", "DI", "Date1"), row.names = c(NA, -42L), class = "data.frame")
> Raw$Date1<-as.Date(Raw$Date,"%d/%m")
> culr<-ifelse(Raw$Year=="Y2002","Year 2002","Year 2014")
> library(lattice)
> xyplot(DI~Date1|Station, data=Raw,
>         groups = culr,
>         par.settings = list(strip.background = list(col = "transparent"),
>                             superpose.symbol = list(cex = rep(2, 2),
>                                                     col=c("grey","black"),
>                                                     pch = rep(16,2))),
>         type="p",
>         xlab=list("Month",cex=1.5),
>         ylab=list("Dispersion index",cex=1.5),
>         index.cond=list(c(1,2,3,4)),
>         auto.key = T,
>         layout=c(4,1),
>         panel=function(Date1,DI){
>         panel.labline(h=1,lty=2,lwd=3)
>         })
>
> Many thanks.
>
> Regards,
> Christine
>
>
>
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