org.tribuo.math.la.MatrixTuple Maven / Gradle / Ivy
/*
* Copyright (c) 2015-2020, Oracle and/or its affiliates. All rights reserved.
*
* Licensed 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 implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.tribuo.math.la;
import java.util.Objects;
/**
* A mutable tuple used to avoid allocation when iterating a matrix.
*
* While it does implement hashcode, don't use it as a key as the hashcode is data dependent.
*/
public class MatrixTuple {
public int i;
public int j;
public double value;
public MatrixTuple() {
this.i = -1;
this.j = -1;
this.value = Double.NaN;
}
public MatrixTuple(int i, int j, int value) {
this.i = i;
this.j = j;
this.value = value;
}
@Override
public boolean equals(Object o) {
if (o instanceof MatrixTuple) {
MatrixTuple otherM = (MatrixTuple) o;
if ((i == otherM.i) && (j == otherM.j)) {
return Math.abs(value - otherM.value) < 1e-12;
} else {
return false;
}
} else {
return false;
}
}
@Override
public int hashCode() {
return Objects.hash(i, j, value);
}
@Override
public String toString() {
return "MatrixTuple(i="+i+",j="+j+",value="+value+")";
}
}