TOpenCLVector.NormL1 Method

Overload List

#	Signature	Description
1	function NormL1: Double;	Calculate the L1-norm of the calling vector.
	└ indexed: function NormL1(Index: Integer; Len: Integer): Double;
2	function NormL1(const Vec: TOpenCLMtxVec; RelativeError: Boolean): Double;	The L1-norm.
	└ indexed: function NormL1(const Vec: TOpenCLMtxVec; VecIndex: Integer; Index: Integer; Len: Integer; RelativeError: Boolean): Double;

Overload 1: function NormL1: Double;

Calculate the L1-norm of the calling vector.

Returns: Double - L-1 norm, defined by the following equation: NormL1 = Sum(|a[i]|), 0 < i < Length-1

Indexed: function NormL1(Index: Integer; Len: Integer): Double;

Calculates the L1 norm from calling vector elements [Index]..[Index+Len-1].

#	Name	Type	Description
1	Index	Integer	start index
2	Len	Integer	element count

Returns: Double

Overload 2: function NormL1(const Vec: TOpenCLMtxVec; RelativeError: Boolean): Double;

The L1-norm.

#	Name	Type	Description
1	Vec	TOpenCLMtxVec	source TOpenCLVector or TOpenCLMatrix
2	RelativeError	Boolean

Returns: Double - L-1 norm, defined by: ||V-Vec||, where V is calling vector.

Remarks:

If the NormL1 is called without any parameters, the NormL1 calculates the norm of calling vector. The L1 norm of ||V-Vec|| is defined by the formula:

\|\text{V} - \text{Vec}\| _{L1} = \sum _{k=0} ^{\text{Length}-1}|\text{V}[k]-\text{Vec}[k]|

If RelativeError is true then the computed norm is divided by the norm of V, and the function returns the "relative error":

\frac{\| \text{V} - \text{Vec}\|}{\|\text{V}\|}

Examples

var a,b: clVector;
c: double;
begin
    a.CopyFromArray(TDoubleArray.Create(1,2,3,4));
    b.CopyFromArray(TDoubleArray.Create(4,3,2,1));
    c := a.NormL1(b,True);
end;

Indexed: function NormL1(const Vec: TOpenCLMtxVec; VecIndex: Integer; Index: Integer; Len: Integer; RelativeError: Boolean): Double;

Calculates the L1 norm ||V-Vec|| between Vec elements [VecIndex]..[VecIndex+Len-1] and calling vector elements [Index]..[Index+Len-1].

#	Name	Type	Description
1	Vec	TOpenCLMtxVec	source TOpenCLVector or TOpenCLMatrix
2	VecIndex	Integer
3	Index	Integer	start index
4	Len	Integer	element count
5	RelativeError	Boolean

Returns: Double

Examples

var a,b: clMatrix;
c: double;
begin
    a.Size(2,2, clFloat, false);
    b.Size(2,2, clFloat, false);

    a.CopyFromArray(TDoubleArray.Create(1,2,3,4));
    b.CopyFromArray(TDoubleArray.Create(4,3,2,1));
    c := a.NormL1(b,True);
end;