On Jul 1, 2010, at 10:56 AM, suse wrote:
Hi,
I want to know the area under a curve, which is not given as a
function, but
as values in a time series. It is not a smooth curve, but switches
often
between positive values and zero (the values describe the moisture
in the
soil over a year, one entry is one day). I already tried
area.between.curves, but got only 0 as result. I guess, it doesn't
work
because of these multiple changes between 0 and positive values
(most of the
time, the values are 0 and in the certain case I tested, the
positive values
were only on single days; but for other values positive values last
longer)
I hope, someone can help me!
?approxfun # will return a function that you can pass to integrate
--
David Winsemius, MD
West Hartford, CT
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