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dear all, I would like to center and scale some columns of a data frame (these include NAs) according to the levels of an index (list of factors from the same data frame). I tried to code it using for...
Dear all, I spent a long time today to find out why symbols( ) didn't display all my points. In fact, the function cannot display circles with a small radius when the range of radii is too large, whereas circles...
All right, my question was unclear... hope this is better I wanted to apply scale to each cell of a vector, that is to each group of values given by a unique combination of the levels of certain factors. The...
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