Origin C Reference > Classes > Composite Data Types > Matrix > Matrix::Matrix

2.2.3.7.2 matrix::matrix

matrix

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include

Description

Default constructor for matrix class.

Copy constructor for matrix class.

Constructor for matrix class that constructs a matrix object from a Dataset object.

Constructor for matrix class that constructs a matrix having a specific size.

Syntax

matrix( )

matrix( matrixbase & mbOriginal )

matrix( Dataset dsDataset )

matrix( UINT nNumRows, UINT nNumCols )

matrix( MatrixObject & mo, BOOL bWriteback = FALSE )

Parameters

mbOriginal: [input] Matrix that is copied

dsDataset: [input] Dataset object from which a matrix object is created

nNumRows: [input] Number of rows in constructed matrix
nNumCols: [input] Number of columns in constructed matrix

mo: [input] the source Matrix object
bWriteback: [input] if TRUE, it will write back the new values into the source on exiting the scope.

Return

Examples

EX1

int matrix_matrix_ex1()
{
    int ii, jj;
    matrix<int> mInts = {{1,2,3},{4,5,6},{7,8,9}};
    printf("mInts:\n");
    for(ii = 0; ii < mInts.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mInts.GetNumCols(); jj++)
            printf("%d\t",mInts[ii][jj]);
        printf("\n");
    }

    matrix mDoublesByDefault = {{1.1,2.2,3.3},{4.4,5.5,6.6},{7.7,8.8,9.9}};
    printf("mDoublesByDefault:\n");
    for(ii = 0; ii < mDoublesByDefault.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mDoublesByDefault.GetNumCols(); jj++)
            printf("%g\t",mDoublesByDefault[ii][jj]);
        printf("\n");
    }
    return 0;
}

EX2

int matrix_matrix_ex2()
{
    int ii, jj;
    matrix mA = {{1,2,3},{4,5,6},{7,8,9}};
    printf("mA:\n");
    for(ii = 0; ii < mA.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mA.GetNumCols(); jj++)
            printf("%g\t",mA[ii][jj]);
        printf("\n");
    }

    matrix mB( mA );
    printf("mB Copy of mA:\n");
    for(ii = 0; ii < mB.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mB.GetNumCols(); jj++)
            printf("%g\t",mB[ii][jj]);
        printf("\n");
    }
    return 0;
}

EX3

int matrix_matrix_ex3()
{
    // Assumes Data1_A data set with 9 elements exists in Origin
    int ii, jj;
    Dataset dsA("Book1",0);
    matrix mA( dsA ); // Construct a matrix from Data1_A
    mA.SetSize(3,3);
    printf("mA:\n");
    for(ii = 0; ii < mA.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mA.GetNumCols(); jj++)
            printf("%g\t",mA[ii][jj]);
        printf("\n");
    }
    return 0;
}

EX4

int matrix_matrix_ex4()
{
    int ii, jj;
    matrix mA(4,5); // Construct an empty 4 x 5 matrix

    printf("mA:\n");
    for(ii = 0; ii < mA.GetNumRows(); ii++)
    {
        for(jj = 0; jj < mA.GetNumCols(); jj++)
        {
            mA[ii][jj] = ii + jj;    
            printf("%g\t",mA[ii][jj]);
        }
        printf("\n");
    }
    return 0;
}

EX5

// Have a matrix with the name "MBook1" in the project, with some values.
// After the function executes, the matrix will contain new values set inside
// the nested for-loops.
void    matrix_matrix_ex5()
{
    MatrixObject	mo("MBook1", 0); 
    matrix	m(mo, TRUE);
 
    int	nRows, nCols;
    if (m.GetSourceDim(nRows, nCols))
        printf("rows = %d\tcols=%d\n", nRows, nCols);
 
    // Change the size and set new values:
    m.SetSize(7, 9);
    for (int row = 0; row < m.GetNumRows(); row++)
    {
        for (int col = 0; col < m.GetNumCols(); col++)
            m[row][col] = (row + 1) * (col + 1);
    }
}