On Jun 1, 2012, at 12:27 PM, pigpigmeow wrote:
Dear all,
I have a lot of problems on R-programming.
for example
my csv. file is ..
That certainly does not look like any csv file I have ever seen.
Date wrfRH wrfsolar wrfwindspeed wrfrain wrftd wrfta
21/10/2010 92.97 22.11 53.27 0 1546.337861 61.00852664
22/10/2010 87.35 21.99 40.89 0 1300.408288 62.85352227
23/10/2010 88.38 21.71 28.04 0.01 1381.768284 54.80594493
24/10/2010 92.32 15.45 22.38 0.51 1113.90981 39.46573663
25/10/2010 93.42 21.59 35.5 0.52 868.4895334 28.42952321
26/10/2010 93.38 20.15 42.58 0.07 1404.722837 40.29300856
i calculate the ratio of wrfRH/wrfsolar for each day.
If you are confused in your terminology, and you really have a
data.frame created by read.table, then adding a column to an existing
data.frame , say the ratio of wrftd divided by wrfta, is really simple:
dfrm$ratio <- with dfrm, wrftd/wrfta)
that is
Date wrfRH wrfsolar wrfwindspeed wrfrain wrftd
wrfta ratio
21/10/2010 92.97 22.11 53.27 0 1546.337861 61.00852664 XXXX
22/10/2010 87.35 21.99 40.89 0 1300.408288 62.85352227 YYYY
23/10/2010 88.38 21.71 28.04 0.01 1381.768284 54.80594493 ZZZZ
24/10/2010 92.32 15.45 22.38 0.51 1113.90981 39.46573663 AAAA
25/10/2010 93.42 21.59 35.5 0.52 868.4895334 28.42952321 BBBB
26/10/2010 93.38 20.15 42.58 0.07 1404.722837 40.29300856 CCCC
how to add new column in the original file ? Anyone can help me?!
--
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David Winsemius, MD
West Hartford, CT
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