[R-sig-eco] extract specific data

[Peter Francis]

Dear List,

I have a data frame called trait with roughly 800 species in, each species have 15 columns of information:

Species		1	2	3	etc..
a			t	y	h
b			f	j	u
c			r	y	u

etc..


I then have another data frame called com with the composition of species in each region, there are 506 different communities:

community	species
NA1102		a
NA1102		c
NA0402		b
NA0402		c
AT1302		a
AT1302		b

etc..


What i want to do is extract the information held in the first data frame for each community and save this as a new data frame.

Resulting in : - 

community_NA1102	

a			t	y	h
c			r	y	u

community_NA0402	

b			f	j	u
c			r	y	u

Thanks in advance for any suggestions / code.