2.2.3.9.34 matrixbase::GetMedian

GetMedian

Description

Get the median cell value of the matrix (as a double). If there are an even number N of cells in the matrix the average of the N/2 and (N+1)/2 sorted cell values is returned.

Syntax

double GetMedian( )

Parameters

Return

Returns the median cell value of the matrix (as a double).

Examples

EX1

// Compute the median value of cells of a matrix
void matrixbase_GetMedian_ex1()
{
    matrix<double> mat1 = {
        {1,  1,  1},
        {2,  3,  4}
    };
    // Output of this program will be like following:
    //   The median value of cells in Matrix1 is: 1.5 (=(1+2)/2) .
    
    MatrixPage MatPg1;
    MatPg1.Create("Origin");
    MatrixLayer MatLy1 = MatPg1.Layers(0);
    Matrix Mat1(MatLy1);
    Mat1 = mat1;

    double dMedian;
    dMedian = Mat1.GetMedian();  // Compute the median value by GetMedian
    printf("  The median value of cells in %s is: %g .\n",
      Mat1.GetName(), dMedian);
}

EX2

// Compute the median value of cells of a matrix including NANUMs
void matrixbase_GetMedian_ex2()
{
    matrix<double> mat1 = {
        {99, 99, 99},
        { 2,  3,  4}
    };
    mat1[0][0]=NANUM;  // set row=1,col=1 to NANUM
    mat1[0][1]=NANUM;  // set row=1,col=2 to NANUM
    mat1[0][2]=NANUM;  // set row=1,col=3 to NANUM
    // Input matrix is:
    //  {--, --, --}
    //  { 2,  3   4}
    //
    // Output of this program will be like following:
    //   The median value of cells in Matrix1 is: 1 .
    
    MatrixPage MatPg1;
    MatPg1.Create("Origin");
    MatrixLayer MatLy1 = MatPg1.Layers(0);
    Matrix Mat1(MatLy1);
    Mat1 = mat1;
    
    double dMedian;
    dMedian = Mat1.GetMedian();  // Compute the median value by GetMedian
    printf("  The median value of cells in %s is: %g .\n",
      Mat1.GetName(), dMedian);
}

Remark

Get the median cell value of the matrix (as a double). And when computing, NANUM is seen as 0.

See Also

matrixbase::GetMean, matrixbase::GetMin, matrixbase::GetMax

Header to Include

origin.h