[R] ggplot2 stacked line plot

[Liam Blanckenberg]

Hadley,

Thanks for the pointing that error out to me. Unfortunately, revising
my code to:

p <- ggplot2(~, aes(x = ~, y = ~, colour = Type)) +
geom_line(aes(colour = Type), position = 'stack')

still does not generate what I'm after. I'm essentially after a line
plot where each 'Type' ('series' in excel lingo) is stacked in an
analogous fashion to a stacked area chart (i.e. geom_area(aes(Fill =
Type), position = 'stack')) - again using lines rather than areas
though.

This chart should look just like a stacked area chart, however rather
than each 'layer' (representing a given 'Type') being filled with a
colour, each layer should have just a coloured line representing its
values. Summing each line vertically for a given value on the x-axis
across all the layers (i.e. 'Types') should then give the total y
value for that x value (just like vertically summing an area chart).
Really all I'm after is a stacked area chart where the fill for each
'Type' has been removed, leaving only a line for each (stacked) Type's
value...

I hope this is somewhat clear!

Many thanks,

Liam





On Wed, Feb 10, 2010 at 1:53 AM, hadley wickham <h.wickham at gmail.com> wrote:
> Hi Liam,
>
> Your syntax is a little off.  You want:
>
> p <- ggplot2(~, aes(x = ~, y = ~, colour = Type)) +
>  geom_area(aes(fill = Type), position = 'stack')
>
> Position isn't an aesthetic.
>
> Hadley
>
> On Sun, Feb 7, 2010 at 10:40 PM, Liam Blanckenberg
> <liam.blanckenberg at gmail.com> wrote:
>> Hi all,
>>
>> I have been hunting around for hours trying to figure out how to
>> generate a stacked line chart using ggplot2. This type of chart can be
>> generated in excel 2007 by selecting: Chart type > Line > Stacked
>> line. I can generate a stacked area chart using the following code:
>>
>>   p <- ggplot2(~, aes(x = ~, y = ~, colour = Type)) +
>> geom_area(aes(position = 'stack', fill = Type))
>>
>> However, when I try and replicate this using the following code for geom_line:
>>
>>   p <- ggplot(~, aes(x = ~, y = ~, colour = Type)) +
>> geom_line(aes(position = 'stack'))
>>
>> the resulting plot is not stacked - i.e. each 'Type' is plotted at its
>> actual value rather than cumulatively to form a stacked chart... I
>> have poured through Hadley's ggplot2 book (ggplot2: elegant graphics
>> for data analysis), the R help list and also done general google
>> searching but cannot find a way to generate this type of plot.
>>
>> R version: 2.9.2
>> ggplot2 version: 0.8.5
>> OS: windows 7 (64-bit).
>>
>> Any suggestions or assistance would be greatly appreciated.
>>
>> Regards,
>>
>> Liam
>>
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>
>
>
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> http://had.co.nz/
>