# whv_rect: Compute (total) weighted hypervolume given a set of... In eaf: Plots of the Empirical Attainment Function

## Description

The function `whv_rect()` calculates the hypervolume weighted by a set of rectangles (with zero weight outside the rectangles). The function `total_whv_rect()` calculates the total weighted hypervolume as `hypervolume() + scalefactor * abs(prod(reference - ideal)) * whv_rect()`. The details of the computation are given by \citetDiaLop2020ejor.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10``` ```whv_rect(data, rectangles, reference, maximise = FALSE) total_whv_rect( data, rectangles, reference, maximise = FALSE, ideal = NULL, scalefactor = 0.1 ) ```

## Arguments

 `data` (`matrix` | `data.frame`) Matrix or data frame of numerical values, where each row gives the coordinates of a point. `rectangles` (`matrix()`) weighted rectangles that will bias the computation of the hypervolume. Maybe generated by `eafdiff()` with `rectangles=TRUE` or by `choose_eafdiff()`. `reference` (`numeric()`) Reference point as a vector of numerical values. `maximise` (`logical()` | `logical(1)`) Whether the objectives must be maximised instead of minimised. Either a single logical value that applies to all objectives or a vector of logical values, with one value per objective. `ideal` (`numeric()`) Ideal point as a vector of numerical values. `scalefactor` (`numeric(1)`) real value within (0,1] that scales the overall weight of the differences. This is parameter psi (ψ) in \citetDiaLop2020ejor.

TODO

## Value

A single numerical value.

## References

\insertAllCited

`read_datasets()`, `eafdiff()`, `choose_eafdiff()`, `whv_hype()`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12``` ```rectangles <- as.matrix(read.table(header=FALSE, text=' 1.0 3.0 2.0 Inf 1 2.0 3.5 2.5 Inf 2 2.0 3.0 3.0 3.5 3 ')) whv_rect (matrix(2, ncol=2), rectangles, reference = 6) whv_rect (matrix(c(2, 1), ncol=2), rectangles, reference = 6) whv_rect (matrix(c(1, 2), ncol=2), rectangles, reference = 6) total_whv_rect (matrix(2, ncol=2), rectangles, reference = 6, ideal = c(1,1)) total_whv_rect (matrix(c(2, 1), ncol=2), rectangles, reference = 6, ideal = c(1,1)) total_whv_rect (matrix(c(1, 2), ncol=2), rectangles, reference = 6, ideal = c(1,1)) ```

eaf documentation built on Dec. 21, 2021, 5:06 p.m.