Re: [R] qplot (ggplot2) faceting histogram with missing values

From: hadley wickham <h.wickham_at_gmail.com>
Date: Mon, 03 Mar 2008 22:14:05 -0600

Hi Ista,

That's a bug, and will be fixed in the next version (hopefully to be released in the next couple of days)

Hadley

On Mon, Mar 3, 2008 at 7:10 PM, Ista Zahn <istazahn_at_gmail.com> wrote:
> Hi,
> I've run into a difficulty with qplot function (in the ggplot2
> package). I can facet histograms even when the faceting variable
> contains missing values, but only so long as the faceting variable is
> not a factor.
>
> Example:
>
> y1 <- rnorm(10)
> x1 <- c(rep(1,5), rep(2,4), NA)
> x2 <- factor(c(rep(1,5), rep(2,4), NA))
> library(ggplot2)
> qplot(y1, geom = "histogram", facets = x1 ~.)# this works
> qplot(y1, geom = "histogram", facets = x2 ~.)# this doesn't work
> Error in if (is.null(data) || nrow(data) == 0) return() :
> missing value where TRUE/FALSE needed
>
> This is with ggplot2_0.5.7, R version 2.6.2, on OS X 10.5.2.
>
> Not that this is terribly hard to work around, for example by
> converting the factor to a vector or simply deleting missing values.
> I'm mostly just curious about why it doesn't work.
>
> By the way, I really like ggplot2, though I must admit I'm struggling
> a bit to understand how it really works (I mostly use qplot). Thanks
> for making this great package available.
> -Ista
>
> ______________________________________________
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>

-- 
http://had.co.nz/

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Received on Tue 04 Mar 2008 - 04:16:51 GMT

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