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package eu.dnetlib.data.mapreduce;
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/**
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* Created by claudio on 14/11/2016.
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*/
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public class Algorithms {
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public static double BASE_MIN = 0;
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public static double BASE_MAX = 1;
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public static double LIMIT_MIN = 0;
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/**
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Source: https://stackoverflow.com/questions/5294955/how-to-scale-down-a-range-of-numbers-with-a-known-min-and-max-value
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f(min) = a
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f(max) = b
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f(x) = x - min ===> f(min) = min - min = 0
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x - min max - min
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f(x) = --------- ===> f(min) = 0; f(max) = --------- = 1
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max - min max - min
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(b-a)(x - min)
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f(x) = -------------- + a
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max - min
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*/
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public static double scale(final double valueIn, final double baseMin, final double baseMax, final double limitMin, final double limitMax) {
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return ((limitMax - limitMin) * (valueIn - baseMin) / (baseMax - baseMin)) + limitMin;
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}
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public static double scale(final double valueIn, final double limitMin, final double limitMax) {
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return scale(valueIn, BASE_MIN, BASE_MAX, limitMin, limitMax);
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}
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public static double scale(final double valueIn, final double limitMax) {
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return scale(valueIn, BASE_MIN, BASE_MAX, LIMIT_MIN, limitMax);
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}
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}
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