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with within and transform in R I found…
sortie entre celibataire à la madeleine with, within, and transform in R. I found that they are useful to deal with data set. I don’t quite understand the explanation in the help page and I can’t not guarantee the correctness of my explanation so I provide some examples to show their behavior. Fist of all, they need data frame or list…
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Difference using names or entries in a column…
femme libre sur saint herblain Difference using names or entries in a column selecting elements from data frame. Use names to select elements from data frame, if possible. When using the names, the slicing index does not need to the the same length as the data, but if one of the column is used, the index and the data should…
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Different behaviors between data frame and matrix in…
Different behaviors between data frame and matrix in R > # Generate an artificial matrix > test.m row.names(test.m) col.names(test.m) # Generate a data frame from the matrix > test.df > > # Selecting elements > ## the row names can be used to select elemnts from a data frame or a matrix > test.idx test.df[test.idx,…