[R] computing a subset using a loop

burton030 burton69 at hotmail.de
Sun Jul 15 17:31:08 CEST 2012

Dear all,

I have a data frame with different variables and I want to build different
subsets out of this data frame using some conditions and I want to use a
loop because there will be a lot of subsets and this would be saving a lot
of time.
I try to give you an overview about my data frame. I have a data frame named
"Baumdaten" and it has one column named "transectID" with different IDs
(A_SEF ,A_LEF, B_SEF etc.) there is another column named "Baumart" with
different species like Abies alba, Betula pendula, etc. I want to build now
subsets and the first subset should be named A_2_SEF_Abies_alba and should
contain all Abies alba that are living in A_2_SEF. So the normal code would


 The following step would be to replace Abies alba with Betula pendula and
so on after doing this for A_SEF I have to start with A_LEF so a lot of time
is needing thats why I want to ask if it is possible doing this by using a
loop? Hope you can understand my problem...

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