[R] performing operations on a dataframe

[sayan]

hey check this
g=x$year
tmp=split(x,g)
tmp1=lapply(tmp,func)
x2=unsplit(tmp1,g)

Lanna Jin wrote:
> 
> Hey all,
> 
> I feel like the solution to this problem should be relatively simple, but
> for some reason I can't find answers or come up with my own solution.
> 
> Given the dataframe:
> (SpA and SpB not important, want to look at distribution of cooccurance
> for
> each year)
> 
> Year SpA SpB Coocc
> 2000  0
> 2000  2
> 2000  1
> 2001  8
> 2001  2
> 2001  0
> 2001  0
> 2002  1
> 2002  2
> 
> How can I apply different functions to the Coocc of each year?
> (Note: Different lengths for each year, ie,
> length(Year==2000)!=length(Year==2001))
> For example, if Year==2000, function(x) x/146; if Year=2001, function(x)
> x/237; etc.
> 
> I've figured out the long convoluted way, but since I plan to operate
> numerous transformations on the different years, is there some way to
> solve
> this in just a few steps?
> 
> Thanks for your answer in advance!
> 
> 
> Lanna
> 
> 	[[alternative HTML version deleted]]
> 
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> 
> 

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