Displaying 3 results from an estimated 3 matches for "littperiod".
2017 Jun 22
2
For loop
Hello R users,
The code below is for loop in R that I want to do to following
calculation at each time i and i-1 in 2:75 dataset
(Litterfall_Ahmed97).
ac = ((LeafBiog at date i
-LeafBiog at date i-1, dataset = leafbiom97) + (littperiod at date i,
dataset= Litterfall_Ahmed97))/(sum (GPP from date i-1 to date i,
dataset=GPP_Ahmed13)/2) .
#code for loop
GPP_Ahmed13$Date <- as.Date(GPP_Ahmed13$Date, '%Y/%m/%d')
Litterfall_Ahmed97$Date <- as.Date(Litterfall_Ahmed97$Date, '%Y/%m/%d')
leafbiom97$Date <- as.Dat...
2017 Jun 21
0
Help/ Mathematics
Hi Ahmed,
Your problem appears trivial as you have already specified the form of
the calculation.
Learn how to "extract" specified elements from a data structure:
# first value
sum(dataset1$NPP[dataset1$date >= date1 &
dataset1$date <= date2])
# second value
dataset2$biomass[dataset2$date == date2] -
dataset2$biomass[dataset2$date == date1]
# third value
2017 Jun 21
4
Help/ Mathematics
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