maths.MatrixVectorOperations Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jstat Show documentation

Java Library for Statistical Analysis.

The newest version!

package maths;

import datasets.DenseMatrixSet;
import datasets.VectorDouble;
import datastructs.IVector;

/**
 * Implements common matrix-vector operations
 */
public class MatrixVectorOperations {

    /**
     * Computes y = M*x
     */
    public static  final  IVector dot(DenseMatrixSet mat, VectorDouble x){


        if(mat.n() != x.size()){
            throw new IllegalStateException("Matrix columns "+mat.n()+" and vector " +
                    " size " +x.size() +" are not equal.");
        }

        IVector rslt = new VectorDouble(mat.m());

        for(int r=0; r row = mat.getRow(r);
            rslt.set(r, VectorOperations.dotProduct(row, x));
        }

        return rslt;
    }


}