Re: [R] Adding text labels to lattice plots with multiple panels

From: Jeff Stevens <stev0175_at_googlemail.com>
Date: Sat, 09 Apr 2011 13:56:34 +0200

Hi,

Thanks for the work around, Dennis. My actual data set has 64 replicates for each factor level combination (rather than the 3 in the example), so the overplotting is quite messy. Any ideas on how to avoid the overplotting?

Jeff

On Fri, Apr 8, 2011 at 7:32 PM, Dennis Murphy <djmuser_at_gmail.com> wrote:
> Hi:
>
> After a number of false starts, I finally consulted Deepayan's book and the
> example on p. 73, suitably adapted, yielded a solution. Add a variable for
> the labels and then...
>
> df$lab <- rep(1:6, each = 3)
> bwplot(dv ~ f1 | f2, data = df, ylim = c(0.5, 1),
>  panel = function(x, y, ..., subscripts) {
>    lab <- df$lab[subscripts]
>    panel.bwplot(x, y,  ...)
>    panel.text(x, 0.55, labels = lab)
>  }
> )
>
> If you look closely, you'll see that each label is overplotted three times.
> A similar plot in ggplot2  would be
>
> library(ggplot2)
> ggplot(df, aes(x = f1, y = dv)) + geom_boxplot() +
>     geom_text(aes(x = as.numeric(f1), lab = lab), y = 0.55, alpha = 0.5) +
>     facet_wrap( ~ f2) + ylim(0.5, 1)
>
> The alpha argument in geom_text() is designed to mitigate the overplotting
> effect somewhat.
>
> HTH,
> Dennis
>
>
> On Fri, Apr 8, 2011 at 5:32 AM, Jeff Stevens <stev0175_at_googlemail.com>
> wrote:
>>
>> Hi,
>>
>> I am trying to add text to the bottom of a lattice bwplot with
>> multiple panels.  I would like to add a label below each boxplot, but
>> the labels do not come from the data.  I've tried the following, code:
>>
>> f1 <- c(rep(c(rep("a", 3), rep("b", 3), rep("c", 3)), 2))
>> f2 <- c(rep("A", 9), rep("B", 9))
>> dv <- c(0.9, 0.8, 0.85, 0.6, 0.65, 0.7, 0.8, 0.85, 0.8, 0.95, 0.85,
>> 0.9, 0.65, 0.7, 0.75, 0.85, 0.9, 0.85)
>> df <- data.frame(f1, f2, dv)
>> lab <- c(1, 2, 3, 4, 5, 6)
>>
>> bwplot(dv ~ f1 | f2, data = df, ylim = c(0.5, 1),
>>  panel = function(x, y, ...) {
>>    panel.bwplot(x, y, ...)
>>    panel.text(x, 0.55, labels = lab)
>>  }
>> )
>>
>> I have two problems.  First, the label values are writing over one
>> another.  I wrote a horrible hack (below) that fixes that problem, but
>> I would like to know if there are better/more flexible ways to do
>> this.
>>
>> bwplot(dv ~ f1 | f2, data = df, ylim = c(0.5, 1),
>>  panel = function(x, y, ...) {
>>    x2 <- as.factor(c("a", "b", "c"))
>>    panel.bwplot(x, y, ...)
>>    panel.text(x2, 0.55, labels = lab)
>>  }
>> )
>>
>> Second, when using the horrible hack the first values are repeated in
>> the second panel.  How do I display the correct values in the second
>> panel?  The subscripts argument seems to do the trick when the labels
>> come from the data, but how do I get the proper values when the labels
>> come from outside of the data?
>>
>>
>> Many thanks,
>> Jeff
>>
>> ______________________________________________
>> R-help_at_r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>

-- 
Jeff Stevens
Center for Adaptive Behavior and Cognition
Max Planck Institute for Human Development
Lentzealle 94
14195 Berlin, Germany

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