# Source code for surrogate.mutation.mutShuffleIndexes

# Copyright 2016 Quan Pan
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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# Author: Quan Pan <quanpan302@hotmail.com>
# License: Apache License, Version 2.0
# Create: 2016-12-02
import random
[docs]def mutShuffleIndexes(variable, prob=0.5):
"""Shuffle the attributes of the input individual and return the mutant.
The *individual* is expected to be a :term:`sequence`. The *prob* argument is the
probability of each attribute to be moved. Usually this mutation is applied on
vector of indices.
:param variable: Decision Variable to be mutated.
:param prob: Independent probability for each attribute to be exchanged to
another position.
:returns: A tuple of one variable.
This function uses the :func:`~random.random` and :func:`~random.randint`
functions from the python base :mod:`random` module.
"""
size = len(variable)
# size = variable.size
for i in xrange(size):
if random.random() < prob:
swap_indx = random.randint(0, size - 2)
if swap_indx >= i:
swap_indx += 1
variable[i], variable[swap_indx] = \

variable[swap_indx], variable[i]
return variable