mikera.vectorz.ops.Absolute Maven / Gradle / Ivy

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Fast double-precision vector and matrix maths library for Java, supporting N-dimensional numeric arrays.

There is a newer version: 0.67.0

package mikera.vectorz.ops;

import mikera.arrayz.INDArray;
import mikera.vectorz.AVector;
import mikera.vectorz.Op;

public class Absolute extends Op {

	public static final Absolute INSTANCE=new Absolute();
	
	@Override
	public double apply(double x) {
		return Math.abs(x);
	}
	
	@Override
	public void applyTo(AVector v) {
		v.abs();
	}
	
	@Override
	public void applyTo(INDArray v) {
		v.abs();
	}


	@Override
	public double averageValue() {
		return 0.5;
	}
	
	@Override
	public boolean hasDerivative() {
		return true;
	}
	
	@Override
	public boolean hasInverse() {
		return false;
	}
	
	@Override
	public boolean hasDerivativeForOutput() {
		return false;
	}
	
	@Override
	public double derivative(double x) {
		return x>=0?1.0:-1.0;
	}

}