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johncolby/rowname_index.R

Created November 1, 2011 20:18
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Example showing indexing/replacement by row names
Raw
rowname_index.R
original = expand.grid(ID1=c('a', 'b', 'c'), ID2 = c('red', 'green', 'blue'))
original$value = 0
replacement = data.frame(ID1='b', ID2='red', value=1)
rownames(original) = paste(original$ID1, original$ID2)
rownames(replacement) = paste(replacement$ID1, replacement$ID2)
original[rownames(replacement), ] = replacement
original
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