de-class {GA} | R Documentation

## Class "de"

### Description

An S4 class for differential evolution algorithm

### Objects from the Class

Objects can be created by calls to the `de` function.

### Slots

`call`

  an object of class `"call"` representing the matched call;

`type`

  a character string specifying the type of genetic algorithm used;

`lower`

  a vector providing for each decision variable the lower bounds of the search space in case of real-valued or permutation encoded optimisations. Formerly this slot was named `min`;

`upper`

  a vector providing for each decision variable the upper bounds of the search space in case of real-valued or permutation encoded optimizations. Formerly this slot was named `max`;

`names`

  a vector of character strings providing the names of decision variables (optional);

`popSize`

  the population size;

`iter`

  the actual (or final) iteration of DE search;

`run`

  the number of consecutive generations without any improvement in the best fitness value before the DE is stopped;

`maxiter`

  the maximum number of iterations to run before the DE search is halted;

`suggestions`

  a matrix of user provided solutions and included in the initial population;

`population`

  the current (or final) population;

`elitism`

  the number of best fitness individuals to survive at each generation;

`stepsize`

  the stepsize or weighting factor;

`pcrossover`

  the crossover probability;

`pmutation`

  the mutation probability;

`optim`

  a logical specifying whether or not a local search using general-purpose optimisation algorithms should be used;

`fitness`

  the values of fitness function for the current (or final) population;

`summary`

  a matrix of summary statistics for fitness values at each iteration (along the rows);

`bestSol`

  if `keepBest = TRUE`, the best solutions at each iteration;

`fitnessValue`

  the best fitness value at the final iteration;

`solution`

  the value(s) of the decision variables giving the best fitness at the final iteration.

### Author(s)

Luca Scrucca

### See Also

For examples of usage see `de`.

[Package GA version 3.2 Index]