Revision 52802
Added by Claudio Atzori over 5 years ago
| modules/dnet-mapreduce-jobs/branches/beta/src/test/java/eu/dnetlib/data/mapreduce/AlgorithmsTest.java | ||
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package eu.dnetlib.data.mapreduce; |
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import java.math.BigDecimal; |
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import org.apache.commons.math.util.MathUtils; |
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import org.junit.Test; |
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final double th = 0.98; |
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final double lb = th - 0.01; |
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System.out.println(MathUtils.round(Algorithms.scale(0.98, lb, 1, 0, 1), 2)); |
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final double scaled = Algorithms.scale(0.9976, lb, 1, 0, 1); |
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System.out.println(MathUtils.round(scaled, 2, BigDecimal.ROUND_HALF_DOWN)); |
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} |
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} |
| modules/dnet-mapreduce-jobs/branches/beta/src/main/java/eu/dnetlib/data/mapreduce/Algorithms.java | ||
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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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} |
Also available in: Unified diff
javadoc and test