CDotProduct.java
/*
* @cond LICENSE
* ######################################################################################
* # LGPL License #
* # #
* # This file is part of the LightJason AgentSpeak(L++) #
* # Copyright (c) 2015-19, LightJason (info@lightjason.org) #
* # This program is free software: you can redistribute it and/or modify #
* # it under the terms of the GNU Lesser General Public License as #
* # published by the Free Software Foundation, either version 3 of the #
* # License, or (at your option) any later version. #
* # #
* # This program 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 Lesser General Public License for more details. #
* # #
* # You should have received a copy of the GNU Lesser General Public License #
* # along with this program. If not, see http://www.gnu.org/licenses/ #
* ######################################################################################
* @endcond
*/
package org.lightjason.agentspeak.action.builtin.math.blas.vector;
import cern.colt.matrix.tdouble.DoubleMatrix1D;
import com.codepoetics.protonpack.StreamUtils;
import org.lightjason.agentspeak.action.builtin.IBuiltinAction;
import org.lightjason.agentspeak.language.CCommon;
import org.lightjason.agentspeak.language.CRawTerm;
import org.lightjason.agentspeak.language.ITerm;
import org.lightjason.agentspeak.language.execution.IContext;
import org.lightjason.agentspeak.language.fuzzy.CFuzzyValue;
import org.lightjason.agentspeak.language.fuzzy.IFuzzyValue;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import java.util.List;
import java.util.stream.Collectors;
/**
* returns dot-product of vectors.
* The action calculates for each tupel of vectors
* the dot-product, so the argument number must be odd
* otherwise the action fails
*
* {@code [D1|D2] = math/blas/vector(V1,V2, [V3, V4] );}
* @see https://en.wikipedia.org/wiki/Dot_product
*/
public final class CDotProduct extends IBuiltinAction
{
/**
* serial id
*/
private static final long serialVersionUID = -953714393424081234L;
/**
* ctor
*/
public CDotProduct()
{
super( 4 );
}
@Nonnegative
@Override
public final int minimalArgumentNumber()
{
return 2;
}
@Nonnull
@Override
public final IFuzzyValue<Boolean> execute( final boolean p_parallel, @Nonnull final IContext p_context,
@Nonnull final List<ITerm> p_argument, @Nonnull final List<ITerm> p_return )
{
final List<DoubleMatrix1D> l_arguments = CCommon.flatten( p_argument ).map( ITerm::<DoubleMatrix1D>raw ).collect( Collectors.toList() );
if ( l_arguments.size() % 2 == 1 )
return CFuzzyValue.from( false );
StreamUtils.windowed( l_arguments.stream(), 2 )
.map( i -> i.get( 0 ).zDotProduct( i.get( 1 ) ) )
.map( CRawTerm::from )
.forEach( p_return::add );
return CFuzzyValue.from( true );
}
}