# [R] two questions re: the use of lattice (Q1 SOLVED, not Q2)

Peter Ehlers ehlers at ucalgary.ca
Mon Jul 23 03:58:39 CEST 2012

```On 2012-07-22 18:03, Ranjan Maitra wrote:
>
>>>> [I had to dig back to see what your Q2 was. It's good to keep context.]
>>>>
>>>> Try this:
>>>>
>>>>     p <- bwplot(Error~Method | sigma + INU, data = z,
>>>>            scales = list(rot=90), horiz = FALSE,
>>>>            layout = c(5,3), col = "red")
>>>>
>>>>     require(latticeExtra)
>>>>     useOuterStrips(p,
>>>>          strip = <<your sigma-strip function>>,
>>>>          strip.left = strip.custom(
>>>>              var.name = "INU", sep = " = ",
>>>>              strip.names = TRUE)
>>>>     )
>>>>
>>>
>>> This works!! Thanks very much!! May I also ask how I can put in a "%"
>>> after the INU value? i.e., I want the labels to be INU = 0%, INU = 20%,
>>> INU = 40% (instead of INU = 0, INU = 20 and INU = 40).
>>
>> Define:
>>
>>     INUExpr <- paste0("INU = ", c(0,20,40), "%")
>>
>> Then
>>
>>       useOuterStrips(p,
>>          strip = <<your sigma-strip function>>,
>>          strip.left = << your strip function with
>>                 var.name = INUExpr[which.panel] >>
>>     )
>>
>> Peter Ehlers
>
> Thanks, Peter! I have been trying things like this all afternoon. But i
> still get the same problem:
>
> The following, from your earlier e-mail works (cut-and-paste should be
> fine):
>
>
> library(lattice)
> library(latticeExtra)
> z <- cbind(rep(c("BIC", "ICL", "s_v", "Q_v", "sig-q",
>                        "s_lsk", "s_lML", "s_mlsk", "s_mlML", "s_la8",
> "s_haar"), each = 250), rep(c(5, 10, 20, 30, 50), each = 50))
> z <- rbind(cbind(z, 0), cbind(z, 20), cbind(z, 40))
> z <- cbind(z, rnorm(n = nrow(z)))
> z <- as.data.frame(z)
> names(z) <- c("Method", "sigma", "INU", "Error")
> sigma <- as.numeric(levels(z\$sigma))
> sigmaExprList <- lapply(sigma, function(s) bquote(italic(sigma) == .
> (s))) sigmaExpr <- as.expression(sigmaExprList)
>
>
>
> p <- bwplot(Error~factor(Method, levels = unique(Method)) | sigma +
> INU, data = z, scales = list(rot=90), horiz = FALSE,
>           layout = c(3,5), col = "red")
>
>    require(latticeExtra)
>
>    useOuterStrips(p,
>         strip =  function(which.given, which.panel, var.name,
>           strip.levels = FALSE,
>           strip.names = TRUE, ...) {
>           strip.default(which.given, which.panel,
>                         var.name = sigmaExpr[which.panel],
>                         strip.levels = FALSE,
>                         strip.names = TRUE, ...)
>          },
>                   strip.custom(
>                                var.name = "INU", sep = " = ",
>                                strip.names = TRUE))
>
>
>
> However, this (edition of the latter) does not:
>
> INUExpr <- paste0("INU = ", c(0,20,40), "%")
>
>    useOuterStrips(p,
>         strip =  function(which.given, which.panel, var.name,
>           strip.levels = FALSE,
>           strip.names = TRUE, ...) {
>           strip.default(which.given, which.panel,
>                         var.name = sigmaExpr[which.panel],
>                         strip.levels = FALSE,
>                         strip.names = TRUE, ...)
>          },
>         strip.left = function(which.given, which.panel, var.name,
>           strip.levels = FALSE,
>           strip.names = TRUE, ...) {
>                   strip.custom(
>             var.name = INUExpr[which.panel],
>             strip.names = TRUE, ...)
>                 }
>    )
>
>
> Clearly, I am doing something wrong in defining the strip function. (It
> does not help that i am not completely at home with it.)  Can you or

Actually, it would work if you made strip.left a more accurate
copy of your strip function. But I hadn't taken a close enough
look at your strip function. I don't think it's needed at all.
Try this:

p <- bwplot(Error ~ Method | sigma + INU, data = z,
scales = list(rot=90), horiz = FALSE,
layout = c(5,3), col = "red")

useOuterStrips(p,
strip = strip.custom(
factor.levels = sigmaExpr),
strip.left = strip.custom(
factor.levels = INUExpr)
)

BTW, you don't need the italic() on sigma - it does nothing in plotmath.

Peter Ehlers

>
> Many thanks again!
> Best wishes,
> Ranjan
>
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