[R] combine barchart and xyplot in lattice

[Naresh Gurbuxani]

I converted to factor because, in barchart, x-axis seems to be factor only.  Without factor, x labels are 1, 2, 3, …

Solution 1 works for me.  If there is a method for barchart, I am interested in looking at that as well.

Thanks,
Naresh
Sent from my iPhone

> On Nov 18, 2023, at 10:09 AM, Deepayan Sarkar <deepayan.sarkar using gmail.com> wrote:
> 
> On Sat, 18 Nov 2023 at 06:44, Naresh Gurbuxani
> <naresh_gurbuxani using hotmail.com> wrote:
>> 
>> In below graph, I would like to add two vertical lines using
>> panel.abline().  Is this possible?
> 
> I assume you want the 'v' variable in panel.abline() to be interpreted
> in the context of your x-axis, which here represents a factor
> variable. Unless two factor variables have the same levels, their
> values don't really mean the same thing. So either you need to specify
> the levels, or make the axis numeric:
> 
> # option 1 - factor
> xyplot(count ~ as.factor(hour), type = "l", lwd = 2,
>       col = 2, data = vehicles,
>       panel = function(x, y, ...) {
>           panel.xyplot(x, y, ...)
>           panel.abline(v = factor(c("9", "17"), levels = levels(x)),
>                        lty = 2, col = "gray")
>       })
> 
> # option 2 - numeric
> xyplot(count ~ hour, type = "l", lwd = 2,
>       col = 2, data = vehicles,
>       panel = function(x, y, ...) {
>           panel.xyplot(x, y, ...)
>           panel.abline(v = c(9, 17), lty = 2, col = "gray")
>       })
> 
> Best,
> -Deepayan
> 
>> 
>> Thanks,
>> Naresh
>> 
>> mydf <- data.frame(hour = rep(6:20, 2),
>> traffic = c(round(dnorm(6:20, 9, 3) * 10000), round(dnorm(6:20, 17, 4) *
>> 10000)),
>> direction = rep(c("inbound", "outbound"), c(15, 15)))
>> 
>> vehicles <- data.frame(hour = 6:20,
>> count = c(100, 120, 140, 125, 105, 80, 70, 75, 80, 100, 110, 120, 115,
>> 110, 100))
>> 
>> library(lattice)
>> library(latticeExtra)
>> 
>> # This works
>> mybars <- barchart(traffic ~ as.factor(hour), groups = direction,
>> stack = TRUE, horizontal = FALSE, data = mydf,
>> auto.key = list(columns = 2, space = "bottom"), xlab = "hour")
>> 
>> mylines <- xyplot(count ~ as.factor(hour), type = "l", lwd = 2,
>> col = 2, data = vehicles)
>> 
>> mybars + mylines
>> 
>> # This does not work.  Lines are not correctly placed.
>> mylines <- xyplot(count ~ as.factor(hour), type = "l", lwd = 2,
>> col = 2, data = vehicles, panel = function(x, y, ...) {
>> panel.xyplot(x, y, ...)
>> panel.abliine(v = as.factor(c(9, 17)), lty = 2, col = "gray")
>> })
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