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/* This file is part of the KDE project
Copyright (C) 2006 Stefan Nikolaus <stefan.nikolaus@kdemail.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
// Local
#include "Solver.h"
#include <kdebug.h>
#include <kpluginfactory.h>
#include <ktextedit.h>
#include <kaction.h>
#include <kstandarddirs.h>
#include <kactioncollection.h>
#include <Formula.h>
#include <Cell.h>
#include <part/Doc.h>
#include <Sheet.h>
#include <Value.h>
#include <part/View.h>
#include <Region.h>
#include "SolverDialog.h"
using namespace Calligra::Sheets::Plugins;
// make the plugin available
K_PLUGIN_FACTORY(SolverFactory, registerPlugin<Calligra::Sheets::Plugins::Solver>();)
K_EXPORT_PLUGIN(SolverFactory("sheetssolver"))
Calligra::Sheets::View* s_view = 0;
Calligra::Sheets::Formula* s_formula = 0;
double _function(const gsl_vector* vector, void *params);
class Solver::Private
{
public:
SolverDialog* dialog;
View* view;
};
Solver::Solver(QObject* parent, const QVariantList& args)
: d(new Private)
{
Q_UNUSED(args)
setXMLFile(KStandardDirs::locate("data", "sheets/viewplugins/solver.rc"), true);
d->dialog = 0;
d->view = qobject_cast<View*>(parent);
if (!d->view) {
kError() << "Solver: Parent object is not a Calligra::Sheets::View! Quitting." << endl;
return;
}
QAction* solver = actionCollection()->addAction("sheetssolver");
solver->setText(i18n("Function Optimizer..."));
connect(solver, SIGNAL(triggered(bool)), this, SLOT(showDialog()));
}
Solver::~Solver()
{
delete d;
}
void Solver::showDialog()
{
d->dialog = new SolverDialog(d->view->selection(), d->view);
connect(d->dialog, SIGNAL(okClicked()), this, SLOT(optimize()));
d->dialog->show();
}
void Solver::optimize()
{
register Sheet * const sheet = d->view->activeSheet();
if (!sheet)
return;
if (d->dialog->function->textEdit()->toPlainText().isEmpty())
return;
if (d->dialog->parameters->textEdit()->toPlainText().isEmpty())
return;
Region region(d->dialog->function->textEdit()->toPlainText(), d->view->doc()->map(), d->view->activeSheet());
if (!region.isValid())
return;
const QPoint point = (*region.constBegin())->rect().topLeft();
const Cell formulaCell = Cell(sheet, point.x(), point.y());
if (!formulaCell.isFormula())
return;
kDebug() << formulaCell.userInput();
s_formula = new Formula(sheet);
if (d->dialog->minimizeButton->isChecked()) {
s_formula->setExpression(formulaCell.userInput());
} else if (d->dialog->maximizeButton->isChecked()) {
// invert the formula
s_formula->setExpression("=-(" + formulaCell.userInput().mid(1) + ')');
} else { // if (d->dialog->valueButton->isChecked())
// TODO
s_formula->setExpression("=ABS(" + formulaCell.userInput().mid(1) + '-'
+ d->dialog->value->text() + ')');
}
// Determine the parameters
int dimension = 0;
Parameters* parameters = new Parameters;
region = Region(d->dialog->parameters->textEdit()->toPlainText(), d->view->doc()->map(), d->view->activeSheet());
Region::ConstIterator end(region.constEnd());
for (Region::ConstIterator it(region.constBegin()); it != end; ++it) {
QRect range = (*it)->rect();
for (int col = range.left(); col <= range.right(); ++col) {
for (int row = range.top(); row <= range.bottom(); ++row) {
parameters->cells.append(Cell(sheet, col, row));
++dimension;
}
}
}
/* Initial vertex size vector with a step size of 1 */
gsl_vector* stepSizes = gsl_vector_alloc(dimension);
gsl_vector_set_all(stepSizes, 1.0);
/* Initialize starting point */
int index = 0;
gsl_vector* x = gsl_vector_alloc(dimension);
foreach(const Cell &cell, parameters->cells) {
gsl_vector_set(x, index++, numToDouble(cell.value().asFloat()));
}
/* Initialize method and iterate */
gsl_multimin_function functionInfo;
functionInfo.f = &_function;
functionInfo.n = dimension;
functionInfo.params = static_cast<void*>(parameters);
// Use the simplex minimizer. The others depend on the first derivative.
const gsl_multimin_fminimizer_type *T = gsl_multimin_fminimizer_nmsimplex;
gsl_multimin_fminimizer* minimizer = gsl_multimin_fminimizer_alloc(T, dimension);
gsl_multimin_fminimizer_set(minimizer, &functionInfo, x, stepSizes);
int status = 0;
int iteration = 0;
const int maxIterations = d->dialog->iterations->value();
double size = 1;
const double epsilon = d->dialog->precision->value();
do {
iteration++;
status = gsl_multimin_fminimizer_iterate(minimizer);
if (status)
break;
size = gsl_multimin_fminimizer_size(minimizer);
status = gsl_multimin_test_size(size, epsilon);
if (status == GSL_SUCCESS) {
kDebug() << "converged to minimum after" << iteration << " iteration(s) at";
}
for (int i = 0; i < dimension; ++i) {
printf("%10.3e ", gsl_vector_get(minimizer->x, i));
}
printf("f() = %7.3f size = %.3f\n", minimizer->fval, size);
} while (status == GSL_CONTINUE && iteration < maxIterations);
// free allocated memory
gsl_vector_free(x);
gsl_vector_free(stepSizes);
gsl_multimin_fminimizer_free(minimizer);
delete parameters;
delete s_formula;
}
double Solver::evaluate(const gsl_vector* vector, void *parameters)
{
Q_UNUSED(vector)
Q_UNUSED(parameters)
return 0.0;
}
double _function(const gsl_vector* vector, void *params)
{
Solver::Parameters* parameters = static_cast<Solver::Parameters*>(params);
for (int i = 0; i < parameters->cells.count(); ++i) {
parameters->cells[i].setValue(Calligra::Sheets::Value(gsl_vector_get(vector, i)));
}
// TODO check for errors/correct type
return numToDouble(s_formula->eval().asFloat());
}
#include "Solver.moc"
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