[R] Help/ Mathematics

Bert Gunter bgunter.4567 at gmail.com
Wed Jun 21 20:54:49 CEST 2017

We expect posters to have made an effort to learn R and show us code
that they have tried. We do not provide free software development. The
"Introduction to R" tutorial that ships with the software is one place
to start, but there are many good web tutorials also available. Just


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Jun 21, 2017 at 11:19 AM, Ahmed Attia <ahmedatia80 at gmail.com> wrote:
> Hi R users,
> I need your help to write a code in r that does the following
> calculation from three different datasets;
> ac = 1/sum (NPP from date 1 to date 2, dataset=1) * (biomass at date 2
> -biomass at date 1, dataset = 2) + (littfall at date 2, dataset=3).
> all the dates are in yr-month-day format. Which library or function
> Should I use to tell R do these calculations of these variables at
> different dates.
> I appreciate your help.
> Ahmed Attia, Ph.D.
> Agronomist & Soil Scientist
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> and provide commented, minimal, self-contained, reproducible code.

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