derivNRoptCpp: Function for identifying the optimum site-specific...

In paulhegedus/OFPE: On-Farm Precision Experiments (OFPE) Data Management and Analysis Tools

Function for identifying the optimum site-specific experimental rate based on profit maximization. This function selects the optimum rate as the rate where the difference in net-return between experimental rates (first derivitave of the net-return vs. experimental rate function) does not exceed the cost of applying one more unit of the experimental rate.

Description

This function calculates the optimum rate for every location in the field to identify the site-specific optimum rate.

Usage

derivNRoptCpp(NRdf, NRoptDat, Nrates, rr, cc, CEXP)

Arguments

NRdf	A matrix with rows for each location in the field and columns for the experimental rate applied. Values are the calculated net-returns.
NRoptDat	A matrix with columns for the optimum experimental rate and the associated net-return for each location in the field. This is filled in below.
Nrates	A matrix with one column with each experimental rate in the range specified by the user.
rr	Integer of the number of observations (rows of NRdf).
cc	Integer of the number of experimental rates (rows of Nrates = columns of NRdf).
CEXP	Double, the cost of the experimental input.

Details

This differs from selecting the rate that yields the highest net- return (selecting 'max' for the optimization method) is highlighted in the following example. The net-return at a point for a rate of X was 120 and the net-return at the point for a rate of X+1 was 121 and the cost of one unit of the experimental input was $3. The optimum rate identified in this function would be X, whereas when 'max' is selected X+1 would be the optimum rate because the net-return was higher despite earning less than the cost of the added input.

Value

NRoptDat.

paulhegedus/OFPE documentation built on Nov. 23, 2022, 5:09 a.m.