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2010 Mar 24
1
flexible alternative to subsetting dataframe inside nested loops
I have a dataFrame variable: L1 L2 L3 ... v1 v2 ... 1 2 3 4 ... I want to process subsets of it as defined by combinations of L1-L2-L3. I do it successfully using nested loops: for (i in valuesOfL1 { for (j in valuesOfL2) { for (k in valuesOfL3) { tempData <- subset(dataFrame, (L1 == i & L2 == j & L3 == k, select=c(v1,v2) )) if (dim(tempData)[1]>0) # does this combination of L1-L2-L3 contain any data? { process(tempData) } } } } It works fine...