com.anrisoftware.globalpom.measurement.StandardValueMath Maven / Gradle / Ivy
/*
* Copyright 2016 Erwin Müller
*
* 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 or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.anrisoftware.globalpom.measurement;
import static org.apache.commons.math3.util.FastMath.abs;
import static org.apache.commons.math3.util.FastMath.sqrt;
/**
* Calculation of error propagation using the standard deviation.
*
* @author Erwin Mueller, [email protected]
* @since 1.10
*/
public class StandardValueMath {
public static double subUncertainty(double sa, double sb) {
return sqrt(pow2(sa) + pow2(sb));
}
public static double mulUncertaintly(double a, double sa, double b,
double sb, double z) {
return sqrt(pow2(sa / a) + pow2(sb / b)) * abs(z);
}
public static double mulUncertaintly(double b, double sb, double z) {
return sqrt(pow2(sb / b)) * abs(z);
}
public static double logUncertainty(double a, double sa) {
return sa / abs(a);
}
public static double expUncertainty(double sa, double z) {
return sa * abs(z);
}
public static double reciprocalUncertaintly(double a, double sa, double z) {
return abs(z) * sa / a;
}
private static double pow2(double value) {
return value * value;
}
}