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/*LICENSE_START*/
/*
* Copyright 1995-2002 Washington University School of Medicine
*
* http://brainmap.wustl.edu
*
* This file is part of CARET.
*
* CARET is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* CARET is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CARET; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*LICENSE_END*/
#include <algorithm>
#include <vector>
#include "StatisticDataGroup.h"
#include "StatisticPermutation.h"
#include "StatisticRandomNumber.h"
#include "StatisticRandomNumberOperator.h"
/**
* constructor.
*/
StatisticPermutation::StatisticPermutation(const PERMUTATION_METHOD permutationMethodIn)
: StatisticAlgorithm("Permutation")
{
permutationMethod = permutationMethodIn;
outputDataGroup = NULL;
}
/**
* destructor.
*/
StatisticPermutation::~StatisticPermutation()
{
if (outputDataGroup != NULL) {
delete outputDataGroup;
outputDataGroup = NULL;
}
}
/**
* execute the algorithm.
*/
void
StatisticPermutation::execute() throw (StatisticException)
{
//
// Verify the input data group
//
if (getNumberOfDataGroups() != 1) {
throw StatisticException("Normalization only allows one data group.");
}
StatisticDataGroup* sdg = getDataGroup(0);
const int numValues = sdg->getNumberOfData();
if (numValues <= 0) {
throw StatisticException("Normalization data group has no values");
}
//
// Copy the data
//
std::vector<float>* outputVector = new std::vector<float>;
for (int i = 0; i < numValues; i++) {
outputVector->push_back(sdg->getData(i));
}
//
// Apply the appropriate algorithm to the values
//
switch (permutationMethod) {
case PERMUTATION_METHOD_RANDOM_SIGN_FLIP:
{
//
// randomly flip signs of values
//
for (int i = 0; i < numValues; i++) {
if (StatisticRandomNumber::randomInteger(-1000, 1000) < 0) {
(*outputVector)[i] = -(*outputVector)[i];
}
}
}
break;
case PERMUTATION_METHOD_RANDOM_ORDER:
{
//
// Randomly shuffle the values
//
StatisticRandomNumberOperator randOp;
std::random_shuffle(outputVector->begin(),
outputVector->end(),
randOp);
}
break;
}
//
// Create the output data group
//
outputDataGroup = new StatisticDataGroup(outputVector,
StatisticDataGroup::DATA_STORAGE_MODE_TAKE_OWNERSHIP);
}
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