Examples of DenseMatrix64F

org.ejml.data.DenseMatrix64F

DenseMatrix64F is a dense matrix with elements that are 64-bit floats (doubles). A matrix is the fundamental data structure in linear algebra. Unlike a sparse matrix, there is no compression in a dense matrix and every element is stored in memory. This allows for fast reads and writes to the matrix.

To keep the code manageable and the library easier to use only basic functions for accessing and editing elements are provided in this class. The numerous operations which can be performed on DenseMatrix64F are contained in various other classes, where the most common operations can be found in the {@link org.ejml.ops.CommonOps} and {@link org.ejml.ops.SpecializedOps} classes.

The matrix is stored internally in a row-major 1D array format:

data[ y*numCols + x ] = data[y][x]

For example:
data =

a₁₁ a₁₂ a₁₃ a₁₄ a₂₁ a₂₂ a₂₃ a₂₄ a₃₁ a₃₂ a₃₃ a₃₄ a₄₁ a₄₂ a₄₃ a₄₄

An alternative to working directly with DenseMatrix64 is {@link org.ejml.simple.SimpleMatrix}. SimpleMatrix is a wrapper around DenseMatrix64F that provides an easier to use object oriented way of manipulating matrices, at the cost of efficiency.
@see org.ejml.ops.CommonOps @see org.ejml.ops.SpecializedOps @see org.ejml.simple.SimpleMatrix @author Peter Abeles

Examples of org.ejml.data.DenseMatrix64F

//        long pointC = System.currentTimeMillis();


//        System.out.println("  bidiag UV "+(pointB-pointA)+" qr UV "+(pointC-pointB));


        if( transposed ) {
            DenseMatrix64F temp = Vt;
            Vt = Ut;
            Ut = temp;
        }
        return false;
    }

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Examples of org.ejml.data.DenseMatrix64F


    @Test
    public void constructor_1d_array() {
        double d[] = new double[]{2,5,3,9,-2,6,7,4};
        SimpleMatrix s = new SimpleMatrix(3,2, true, d);
        DenseMatrix64F m = new DenseMatrix64F(3,2, true, d);


        EjmlUnitTests.assertEquals(m,s.getMatrix(),1e-8);
    }

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Examples of org.ejml.data.DenseMatrix64F

    @Test
    public void constructor_2d_array() {
        double d[][] = new double[][]{{1,2},{3,4},{5,6}};


        SimpleMatrix s = new SimpleMatrix(d);
        DenseMatrix64F mat = new DenseMatrix64F(d);


        EjmlUnitTests.assertEquals(mat,s.getMatrix(),1e-8);
    }

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Examples of org.ejml.data.DenseMatrix64F

        EjmlUnitTests.assertEquals(mat,s.getMatrix(),1e-8);
    }


    @Test
    public void constructor_dense() {
        DenseMatrix64F mat = RandomMatrices.createRandom(3,2,rand);
        SimpleMatrix s = new SimpleMatrix(mat);


        assertTrue( mat != s.getMatrix() );
        EjmlUnitTests.assertEquals(mat,s.getMatrix(),1e-8);
    }

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Examples of org.ejml.data.DenseMatrix64F

    /**
     * Performs a decomposition and makes sure the input matrix is not modified.
     */
    public static boolean safeDecomposition( DecompositionInterface decomp , DenseMatrix64F A ) {


        DenseMatrix64F A_orig = decomp.inputModified() ? A.copy() : A;


        return decomp.decompose(A_orig);
    }

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Examples of org.ejml.data.DenseMatrix64F

        EjmlUnitTests.assertEquals(orig.mat,copy.mat,1e-8);
    }


    @Test
    public void wrap() {
        DenseMatrix64F mat = RandomMatrices.createRandom(3,2,rand);


        SimpleMatrix s = SimpleMatrix.wrap(mat);


        assertTrue(s.mat == mat);
    }

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Examples of org.ejml.data.DenseMatrix64F


    @Test
    public void identity() {
        SimpleMatrix s = SimpleMatrix.identity(3);


        DenseMatrix64F d = CommonOps.identity(3);


        EjmlUnitTests.assertEquals(d,s.mat,1e-8);
    }

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Examples of org.ejml.data.DenseMatrix64F

     * flag.
     *
     * @param decomp
     */
    public static void checkModifiedInput( DecompositionInterface decomp ) {
        DenseMatrix64F A = RandomMatrices.createSymmPosDef(4,new Random(0x434));
        DenseMatrix64F A_orig = A.copy();


        assertTrue(decomp.decompose(A));


        boolean modified = !MatrixFeatures.isEquals(A,A_orig);

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Examples of org.ejml.data.DenseMatrix64F

    {
        Random rand = new Random(0xfff);


        int width = 10;


        DenseMatrix64F A = RandomMatrices.createRandom(width,width,rand);


        DeterminantFromMinor minor = new DeterminantFromMinor(width);
        double minorVal = minor.compute(A);


        LUDecompositionAlt alg = new LUDecompositionAlt();

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Examples of org.ejml.data.DenseMatrix64F

    @Test
    public void transpose() {
        SimpleMatrix orig = SimpleMatrix.random(3,2, 0, 1, rand);
        SimpleMatrix tran = orig.transpose();


        DenseMatrix64F dTran = new DenseMatrix64F(2,3);
        CommonOps.transpose(orig.mat,dTran);


        EjmlUnitTests.assertEquals(dTran,tran.mat,1e-8);
    }

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