search for: a_sef

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2012 Jul 15
4
computing a subset using a loop
...e 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 wou...