search for: echinata

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2006 Dec 30
3
getting a new factor
...1 Sphagnum subsecundum M A En 100 2 Sphagnum denticulatum M A En 200 3 Molinia caerulea M A En 300 4 Sphagnum flexuosum M A En 400 5 Juncus squarrosus M A En 500 6 Carex echinata M A En 600 I do need a new one with a new factor constructed from a concatenation of the two first columns, genus and species. I am guessing this must be a simple matter while working with R, but I am stuck at this point. Any help will be welcome! Thanks. --- Ricardo Rodr?g...