R help - Mar 2008 - Storing output in an array or matrix

I have a data set which has, let's say, income by state.  I'm trying to
output income quartiles for each state into an array by doing a loop so that
I don't have to do it state by state by hand.

ie, something like

for (i in 1:50) {

quantile(subset(data,state==i)$income) -> r[i,5]   }


where the output of quantile will give 5 columns for each state.    r would
be a 50x5 matrix where each row represents state i's income quartiles.  

thanks
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I think you could get this done with the function "tapply", but
it's not
clear because you don't give an example of your data.  If tapply is not 
the answer, certainly there is a way that is better than resorting to 
doing it 'by hand' (brute force).

See ?tapply

Best,
Erik Iverson

tieflingrogue wrote:
> 
> 
> I have a data set which has, let's say, income by state.  I'm
trying to
> output income quartiles for each state into an array by doing a loop so
that
> I don't have to do it state by state by hand.
> 
> ie, something like
> 
> for (i in 1:50) {
> 
> quantile(subset(data,state==i)$income) -> r[i,5]   }
> 
> 
> where the output of quantile will give 5 columns for each state.    r would
> be a 50x5 matrix where each row represents state i's income quartiles.
> 
> thanks