| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.sysds.runtime.functionobjects; |
| |
| import org.apache.sysds.runtime.util.UtilFunctions; |
| |
| public class IntegerDivide extends ValueFunction |
| { |
| |
| private static final long serialVersionUID = -6994403907602762873L; |
| |
| private static IntegerDivide singleObj = null; |
| |
| private IntegerDivide() { |
| // nothing to do here |
| } |
| |
| public static IntegerDivide getFnObject() { |
| if ( singleObj == null ) |
| singleObj = new IntegerDivide(); |
| return singleObj; |
| } |
| |
| |
| @Override |
| public double execute(double in1, double in2) { |
| return executeIntDiv(in1, in2); |
| } |
| |
| @Override |
| public double execute(long in1, long in2) { |
| return executeIntDiv(in1, in2); |
| } |
| |
| /** |
| * NOTE: The R semantics of integer divide a%/%b are to compute the |
| * double division and subsequently cast to int. In case of a NaN |
| * or +-INFINITY division result, the overall output is NOT cast to |
| * int in order to prevent the special double values. |
| * |
| * @param in1 double input 1 |
| * @param in2 double input 2 |
| * @return result |
| */ |
| private static double executeIntDiv( double in1, double in2 ) |
| { |
| //compute normal double division |
| double ret = in1 / in2; |
| |
| //check for NaN/+-INF intermediate (cast to int would eliminate it) |
| if( Double.isNaN(ret) || Double.isInfinite(ret) ) |
| return ret; |
| |
| //safe cast to int |
| return UtilFunctions.toLong( ret ); |
| } |
| } |