[R] Plotting the mean of data

[Kare Edvardsen]

Hi all!

I've got a datstructure like this:

subject  week  value

1	1	4
2	1	8
3	1	3
4	1	5

1	2	5
2	2	6
3	2	2
4	2	6

1	3	3
2	3	7
3	3	3
4	3	7

I'd like to plot the mean of 'value' against week. Is there a direct way 
of doing this or do I have to make a new structure with the calculated 
values and then plot it?

All the best!

-- 
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Kare Edvardsen <kare.edvardsen at nilu.no>
Norwegian Institute for Air Research (NILU)
Polarmiljosenteret
NO-9296 Tromso       http://www.nilu.no
Swb. +47 77 75 03 75 Dir. +47 77 75 03 90
Fax. +47 77 75 03 76 Mob. +47 90 74 60 69
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