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High-performance Java Dataframe with integrated columnar storage (fork of tablesaw)

There is a newer version: 0.9.1

package org.datavec.dataframe.reducing;

import org.datavec.dataframe.api.*;

/**
 * Functions that calculate values over the data of an entire column, such as sum, mean, std. dev, etc.
 */
public interface NumericReduceFunction {

    String functionName();

    double reduce(double[] data);

    default double reduce(DoubleColumn data) {
        return this.reduce(data.toDoubleArray());
    }

    default double reduce(FloatColumn data) {
        return this.reduce(data.toDoubleArray());
    }

    default double reduce(IntColumn data) {
        return this.reduce(data.toDoubleArray());
    }

    default double reduce(ShortColumn data) {
        return this.reduce(data.toDoubleArray());
    }

    default double reduce(LongColumn data) {
        return this.reduce(data.toDoubleArray());
    }
}