Try this:

tapply(B, factor(A, levels = seq(max(A))), sum)

On Thu, Aug 27, 2009 at 9:26 AM, Maithili Shiva <maithili_shiva@yahoo.com>wrote:

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> Dear Sirs,
>
> At the outset I sincerely apologize for reproducing my query to you. I also
> thank all of you for the solution you had provided. It has worked on the
> actual data I am working with.
>
> However, there is this peculiar problem which I had realized only after I
> had obtained my results.
>
> e.g. in the example I had attached
>
> A <- c(2, 2, 1, 3, 7, 3, 3, 1, 14, 7, 31)
> B <- c(0.0728,0.9538,4.0140,0.0020,2.5593,0.1620,2.513,0.3798,
> .0033,0..2282, 0.1614)
>
> tapply( B, A, sum)
>
> I get R output as –
>
>  1          2          3            7            14          31
> 4.3938   1.0266   2.6770    2.7875    0.0033    0.1614
>
> However, my requirement is I should get the output as
>
> 1          2          3         4  5  6  7         8  9 …. 14 ………..31
> 4.3938 1.0266  2.6770   0  0  0  2.7875  0  0 ..0.0033 .. 0.161
>
> i.e. my output should include the values 4, 5, 6, etc. which are not part
> of dataset A and the corresponding totals in B (which are anyways 0’s). I
> need this for my further analysis. Its possible for me to add these 0’s
> manually, however when the dataset is large, its not practical.
>
> I am attaching herewith an excel file. I will be grateful if you can guide
> me.
>
> Thanks in advance
>
> Maithili
> start: 2009-08-18 end: 0000-00-00
>
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>
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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