R help - Jan 2010 - Strange tick in ggplot geom_area; and ordering, again

In the area plots below, I see 4 triangle ticks at both sides of the bar; I
believe these are non-stacked values for p, but they are definitively
confusing.

In addition, I would like to get the order of the colors in the plot the
same as in the legend, and not arranged alphabetically (the factor is
ordered, don't touch my order). Hadley once mentioned an undocumented
aestetics "order", but I could not get it to work in the example.

Dieter


library(ggplot2)
cf1 = structure(list(dur = c(10L, 10L, 10L, 10L, 10L, 150L, 150L,
150L, 150L, 150L), score = structure(c(3L, 1L, 4L, 5L, 2L, 3L,
1L, 4L, 5L, 2L), .Label = c("none", "weak",
"moderate", "severe",
"verysevere"), class = c("ordered", "factor")), p
= c(0.04, 0.02,
0.26, 0.6, 0.07, 0.07, 0.05, 0.33, 0.42, 0.14)), .Names = c("dur",
"score", "p"), class = c("cast_df",
"data.frame"))

# columns do not ad to 100% because of rounding; never mind

qplot(dur,p,data=cf1, fill=score)+  geom_area()


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Hi Dieter,

It looks like a bug:

Order works fine with bars:
qplot(factor(dur),weight=p,data=cf1, fill=score, geom = "bar", order
rev(score))

but not with areas:
qplot(dur, p, data=cf1, fill=score, geom = "area", order = rev(score))

I'll add it to my to do list.

Hadley

On Tue, Jan 26, 2010 at 10:05 AM, Dieter Menne
<dieter.menne at menne-biomed.de> wrote:
>
> In the area plots below, I see 4 triangle ticks at both sides of the bar; I
> believe these are non-stacked values for p, but they are definitively
> confusing.
>
> In addition, I would like to get the order of the colors in the plot the
> same as in the legend, and not arranged alphabetically (the factor is
> ordered, don't touch my order). Hadley once mentioned an undocumented
> aestetics "order", but I could not get it to work in the example.
>
> Dieter
>
>
> library(ggplot2)
> cf1 = structure(list(dur = c(10L, 10L, 10L, 10L, 10L, 150L, 150L,
> 150L, 150L, 150L), score = structure(c(3L, 1L, 4L, 5L, 2L, 3L,
> 1L, 4L, 5L, 2L), .Label = c("none", "weak",
"moderate", "severe",
> "verysevere"), class = c("ordered",
"factor")), p = c(0.04, 0.02,
> 0.26, 0.6, 0.07, 0.07, 0.05, 0.33, 0.42, 0.14)), .Names =
c("dur",
> "score", "p"), class = c("cast_df",
"data.frame"))
>
> # columns do not ad to 100% because of rounding; never mind
>
> qplot(dur,p,data=cf1, fill=score)+ ?geom_area()
>
>
> --
> View this message in context:
http://n4.nabble.com/Strange-tick-in-ggplot-geom-area-and-ordering-again-tp1294692p1294692.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>


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Hi, Hadley,

 

can you also reproduce the “triangles” problem? Is it just a trivial corollary
of the order-bug?

 

Dieter

 

 

From: hadley wickham [via R] [mailto:ml-node+1294703-876505379@n4.nabble.com] 
Sent: Tuesday, January 26, 2010 5:18 PM
To: Dieter Menne
Subject: Re: [R] Strange tick in ggplot geom_area; and ordering, again

 

Hi Dieter, 

It looks like a bug: 

Order works fine with bars: 
qplot(factor(dur),weight=p,data=cf1, fill=score, geom = "bar", order =
rev(score)) 

but not with areas: 
qplot(dur, p, data=cf1, fill=score, geom = "area", order = rev(score))

I''ll add it to my to do list. 



 


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	[[alternative HTML version deleted]]

Hi, Hadley,

 

In case you have a temporary workaround, it would be nice to have it. It’s a
show stopper for my report. Bars are not an option, because the curve looks too
jaggy.

 

‘Dieter

 

 

From: hadley wickham [via R] [mailto:ml-node+1294703-876505379@n4.nabble.com] 
Sent: Tuesday, January 26, 2010 5:18 PM
To: Dieter Menne
Subject: Re: [R] Strange tick in ggplot geom_area; and ordering, again

 

Hi Dieter, 

It looks like a bug: 

Order works fine with bars: 
qplot(factor(dur),weight=p,data=cf1, fill=score, geom = "bar", order =
rev(score)) 

but not with areas: 



 


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	[[alternative HTML version deleted]]

> can you also reproduce the ?triangles? problem? Is it just a trivial
corollary of the order-bug?
The triangles are there because you have a layer of points (from the
qplot default) and layer of areas.  Setting geom = "area" in qplot
fixes that.

Hadley

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>
> In case you have a temporary workaround, it would be nice to have it. It?s
a show stopper for my report. Bars are not an option, because the curve looks
too jaggy.
>
I just remember that to work around the problem, you can just manually
order the data frame:

cf1 <- cf1[with(cf1, order(dur, score, decreasing = T)), ]
qplot(dur,p,data=cf1, fill=score, order = rev(score), geom = "area")

Hadley


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