Matrix::CumSum Method

Matrix Struct

Overload List

#SignatureDescription
1TMtxVec *CumSum(int Index, int Len) const;Cumulative sum.
2TMtxVec *CumSum(TMtxVec *Vec, int VecIndex, int Index, int Len) const;Calculate the cumulative sum for Vec elements [VecIndex]..[VecIndex+Len-1].
3TMtx *CumSum() const;Cumulative sum for each of the matrix columns.
4TMtx *CumSum(TMtx *Mtx) const;Calculate tehe cumulative sum for each of the X matrix columns.

Overload 1: TMtxVec *CumSum(int Index, int Len) const;

Cumulative sum.

#NameTypeDescription
1Indexint
2Lenint
Remarks:

Calculate the cumulative sum for calling object elements [Index]..[Index+Len-1] in-place. An exception is raised if Matrix::ConditionCheck is true and array borders are overrun.

Examples
#include "MtxExpr.h"

using namespace Dew;
using namespace Dew::Math;

void Example()
{
    Matrix a;

    a.SetIt(2, 2, false, DewArray<double>{1, 2, 3, 4});
    a.CumSum(0, 4); // a = [1,3,6,10]
}
See Also: Matrix::Sum
Declared in Dew::Math::Matrix · Dew.Math/MtxExpr.h · Cross-compiler

Overload 2: TMtxVec *CumSum(TMtxVec *Vec, int VecIndex, int Index, int Len) const;

Calculate the cumulative sum for Vec elements [VecIndex]..[VecIndex+Len-1].

#NameTypeDescription
1VecTMtxVec *
2VecIndexint
3Indexint
4Lenint
Remarks:

Store the results in calling object elements [Index]..[Index+Len-1]. Size and Matrix::Complex properties of the calling object must be set explicitly. Exception is raised if Matrix::ConditionCheck property is True and array borders are overrun.

Examples
#include "MtxExpr.h"

using namespace Dew;
using namespace Dew::Math;

void Example()
{
    Matrix a;

    a = {{1, 2}, {3, 4}};
    a.CumSum(0, 4); // a = [1,3,6,10]
}
Declared in Dew::Math::Matrix · Dew.Math/MtxExpr.h · Cross-compiler

Overload 3: TMtx *CumSum() const;

Cumulative sum for each of the matrix columns.

Remarks:

Calculate the cumulative sum for each of the calling matrix columns in-place.

Examples
#include "MtxExpr.h"

using namespace Dew;
using namespace Dew::Math;

void Example()
{
    Matrix Mtx;

    Mtx.SetIt(3, 2, false, DewArray<double>{1, 2,
        2, 5,
        3, 1});
    Mtx.CumSum();
    // Mtx becomes:
    // 1, 2
    // 3, 7
    // 6, 8
}
See Also: Matrix::SumCols
Declared in Dew::Math::Matrix · Dew.Math/MtxExpr.h · Cross-compiler

Overload 4: TMtx *CumSum(TMtx *Mtx) const;

Calculate tehe cumulative sum for each of the X matrix columns.

#NameTypeDescription
1MtxTMtx *
Remarks:

Store the results in calling matrix. The Matrix::Rows, Matrix::Cols and Matrix::Complex properties of the callig matrix are adjusted implicitly to match those of Mtx matrix.

Declared in Dew::Math::Matrix · Dew.Math/MtxExpr.h · Cross-compiler