R help - May 2010 - Barchart reorder

Hi fellow R users,

I have a dataset that looks something like this.

species	class 	abundance
K	1	592
K	2	288
G	1	254
G	2	239
C	2	173
D	2	123
E	3	89
F	2	87
B	2	86
H	2	82
I	1	79
J	2	76
B	1	73
D	3	72
A	2	62
L	2	58

I want to plot a stacked barchart. species is the x-axis, abundance is
y-axis, and class will appear as the stacks in different colours. I
need the species to be displayed in descending order of abundance,
meaning species K on the left side of the graph to species L on the
right.

I've read other posts here that recommended the function reorder,
which I've used but species K appears on the right side of the graph
instead.

barchart(table$abundance ~ reorder(table$species, table$abundance),
	   groups = table$class, stack = T, scales = list(x = list(draw F)),
	   auto.key = list(adj = 1))

Is there anything wrong with my code?

Thanks.
Kang Min

Reorder it based on the negative of abundance to reverse it:
reorder(table$species, - table$abundance)

On Sat, May 15, 2010 at 6:40 AM, Kang Min <ngokangmin at gmail.com>
wrote:
> Hi fellow R users,
>
> I have a dataset that looks something like this.
>
> species class ? abundance
> K ? ? ? 1 ? ? ? 592
> K ? ? ? 2 ? ? ? 288
> G ? ? ? 1 ? ? ? 254
> G ? ? ? 2 ? ? ? 239
> C ? ? ? 2 ? ? ? 173
> D ? ? ? 2 ? ? ? 123
> E ? ? ? 3 ? ? ? 89
> F ? ? ? 2 ? ? ? 87
> B ? ? ? 2 ? ? ? 86
> H ? ? ? 2 ? ? ? 82
> I ? ? ? 1 ? ? ? 79
> J ? ? ? 2 ? ? ? 76
> B ? ? ? 1 ? ? ? 73
> D ? ? ? 3 ? ? ? 72
> A ? ? ? 2 ? ? ? 62
> L ? ? ? 2 ? ? ? 58
>
> I want to plot a stacked barchart. species is the x-axis, abundance is
> y-axis, and class will appear as the stacks in different colours. I
> need the species to be displayed in descending order of abundance,
> meaning species K on the left side of the graph to species L on the
> right.
>
> I've read other posts here that recommended the function reorder,
> which I've used but species K appears on the right side of the graph
> instead.
>
> barchart(table$abundance ~ reorder(table$species, table$abundance),
> ? ? ? ? ? groups = table$class, stack = T, scales = list(x = list(draw >
F)),
> ? ? ? ? ? auto.key = list(adj = 1))
>
> Is there anything wrong with my code?
>
> Thanks.
> Kang Min
>
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