/*!
* \brief Randomly select a node that takes arguments from a specific
* tree in the individual.
* \return Randomly selected tree
*/
unsigned int GP::Individual::chooseRandomNodeWithArgs(unsigned int inTree,
GP::Context& ioContext) const
{
Beagle_StackTraceBeginM();
const GP::Tree& lTree = *(operator[](inTree));
unsigned int lSize = lTree.size();
if (lSize < 2) {
std::ostringstream lOSS;
lOSS << "In GP::Individual::chooseRandomNodeWithArgs(): ";
lOSS << "Could not choose a node with arguments because the specified tree has fewer ";
lOSS << "than two (" << lSize << ") nodes, hence there are no such nodes";
lOSS << " in the tree. This occurred while calling chooseRandomNodeWithArgs() with an ";
lOSS << "inTree value of " << inTree;
throw Beagle_RunTimeExceptionM(lOSS.str());
}
// Loop through the tree adding appropriate nodes into the roulette
RouletteT<unsigned int> lRoulette;
for (unsigned int i=0; i<lSize; i++) {
if(lTree[i].mSubTreeSize > 1) lRoulette.insert(i);
}
// Select node with roulette
Beagle_AssertM(!lRoulette.empty());
return lRoulette.select(ioContext.getSystem().getRandomizer());
Beagle_StackTraceEndM();
}
/*!
* \brief Randomly select a node that takes no argument from a specific
* tree in the individual.
* \return Randomly selected tree
*/
unsigned int GP::Individual::chooseRandomNodeWithoutArgs(unsigned int inTree,
GP::Context& ioContext) const
{
Beagle_StackTraceBeginM();
// Loop through the tree adding appropriate nodes into the roulette
unsigned int lSize = operator[](inTree)->size();
RouletteT<unsigned int> lRoulette;
for (unsigned int i=0; i<lSize; i++) {
if (operator[](inTree)->operator[](i).mSubTreeSize == 1) {
lRoulette.insert(i);
}
}
// Select node with roulette
Beagle_AssertM(!lRoulette.empty());
return lRoulette.select(ioContext.getSystem().getRandomizer());
Beagle_StackTraceEndM();
}