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 * Java implementation of the SciJava Ops matching engine.
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package org.scijava.ops.engine.math;

import java.util.Arrays;

import org.scijava.function.Functions;
import org.scijava.ops.spi.Op;
import org.scijava.ops.spi.OpClass;

public class Normalize {

	public static final String NAMES = "math.minmax";

	@OpClass(names = NAMES)
	public static class MathMinMaxNormalizeFunction implements
		Functions.Arity3<double[], Double, Double, double[]>, Op
	{

		/**
		 * TODO
		 *
		 * @param t
		 * @param newMin
		 * @param newMax
		 */
		@Override
		public double[] apply(double[] t, Double newMin, Double newMax) {
			if (newMax == null) {
				newMax = 1.0;
			}
			if (newMin >= newMax) {
				throw new IllegalStateException("Min must be smaller than max.");
			}

            var min = Arrays.stream(t).min().getAsDouble();
            var max = Arrays.stream(t).max().getAsDouble();
			double nMin = newMin;
			double nMax = newMax;

			return Arrays.stream(t).map(d -> norm(d, min, max, nMin, nMax)).toArray();
		}

		private double norm(double d, double dataMin, double dataMax, double newMin,
			double newMax)
		{
			return newMin + (((d - dataMin) * (newMax - newMin)) / (dataMax -
				dataMin));
		}
	}

}
