matrixbase::SetSize

SetSize

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

Description

Set the size of any matrixbase derived object.

Syntax

BOOL SetSize( UINT wNumRows, UINT wNumCols, BOOL bKeepData = FALSE )

Parameters

wNumRows: [input] The number of rows in the newly sized matrix
wNumCols: [input] The number of columns in the newly sized matrix
bKeepData: [input] TRUE, when matrix already has data, the data in same position will be same as before doing SetSize.; If the new size is bigger than original size, for new cells, they are filled with zeros, just same as in new matrix creation;; FALSE when matrix already has data, the data in same position will be not same as before doing SetSize.

Return

Returns TRUE on success or FALSE on failure.

Examples

EX1

// Simple size setting for a new matrix
void matrixbase_SetSize_ex1()
{
    BOOL rc;
    
    matrix mat1;
    int wNumRows = 3;
    int wNumCols = 4;
    rc=mat1.SetSize( wNumRows, wNumCols );      // Set the number of rows and columns in matrix
    
    if(!rc) 
        printf("Error: SetSize on a matrix failed.\n");
    else
    {
        MatrixPage MatPg1;
        MatPg1.Create("Origin");
        MatrixLayer MatLy1 = MatPg1.Layers(0);
        Matrix Mat1(MatLy1);
        Mat1 = mat1;
        printf("Observe if the created Origin matrix window %s is %dx%d\n",
          Mat1.GetName(),wNumRows,wNumCols);
    }
}

EX2

// Shrink an already-existing matrix
void matrixbase_SetSize_ex2()
{
    BOOL rc;

    matrix<double> mat1 = {
        {1,  1,  1,  1},
        {2,  4,  6,  8},
        {3,  6,  9, 12}
    };
    MatrixPage MatPg1;
    MatPg1.Create("Origin");
    MatrixLayer MatLy1 = MatPg1.Layers(0);
    Matrix Mat1(MatLy1);
    Mat1 = mat1;
    printf("The original matrix %s is 3x4.\n",Mat1.GetName());
    
    
    matrix mat2(mat1);
    rc=mat2.SetSize( 2, 2, TRUE);      // Shrink matrix to 2x2; bKeepData = TRUE;
    
    if(!rc) 
        printf("Error2: SetSize on a matrix failed.\n");
    else
    {
        MatrixPage MatPg2;
        MatPg2.Create("Origin");
        MatrixLayer MatLy2 = MatPg2.Layers(0);
        Matrix Mat2(MatLy2);
        Mat2 = mat2;
        printf("Observe that the shrunk matrix %s is 2x2, and the values are preserved.\n",
          Mat2.GetName());
    }
}

EX3

// Expand an already-existing matrix
void matrixbase_SetSize_ex3()
{
    BOOL rc;

    matrix<double> mat1 = {
        {1,  1,  1,  1},
        {2,  4,  6,  8},
        {3,  6,  9, 12}
    };
    MatrixPage MatPg1;
    MatPg1.Create("Origin");
    MatrixLayer MatLy1 = MatPg1.Layers(0);
    Matrix Mat1(MatLy1);
    Mat1 = mat1;
    printf("The original matrix %s is 3x4.\n",Mat1.GetName());
    
    
    matrix mat3(mat1);
    rc=mat3.SetSize( 4, 5, FALSE);      // Expanded matrix to 4x5; bKeepData = FALSE;
    if(!rc) 
        printf("Error3: SetSize on a matrix failed.\n");
    else
    {
        MatrixPage MatPg3;
        MatPg3.Create("Origin");
        MatrixLayer MatLy3 = MatPg3.Layers(0);
        Matrix Mat3(MatLy3);
        Mat3 = mat3;
        printf("Observe that the expanded matrix %s is 4x5, and the original data may be broken.\n",
          Mat3.GetName());
    }
}