On Jun 1, 2012, at 4:08 PM, David Winsemius wrote:
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
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$ratio <- with dfrm, wrftd/wrfta)
And that of course should have been :
dfrm$ratio <- with( dfrm, wrftd/wrfta)
--
David Winsemius, MD
West Hartford, CT
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