TVec.DownSample Method

Overload List

#	Signature	Description
1	function DownSample(const Src: TMtxVec; Factor: Integer; Phase: Integer): TVec;	Downsamples vector values.
2	function DownSample(const Src: TMtxVec; Factor: Integer; SrcIndex: Integer; Index: Integer; Len: Integer; Phase: Integer): TMtxVec;	Downsamples object values.

Overload 1: function DownSample(const Src: TMtxVec; Factor: Integer; Phase: Integer): TVec;

Downsamples vector values.

#	Name	Type
1	Src	TMtxVec
2	Factor	Integer
3	Phase	Integer

Result: stored in self (calling object), returns self for chaining

Remarks:

The methods copies only every Factor sample from the Src vector to the calling vector. The TMtxVecBase.Length and TMtxVec.Complex properties of the calling vector are set implicitly. The phase parameter determines the initial sample offset. Phase must be less than Factor.

Examples

var a,b: TVec;
begin
    CreateIt(a,b);
    try
        b.SetIt(False,[0,0,0,0,1,2,3,4,5,6]);
        a.DownSample(b,2); // a = [0,0,1,3,5]
    finally
        FreeIt(a,b);
    end;
end;

See Also: TVec.UpSample, TDenseMtxVec.UpSample, TVec.PixelDownSample

Overload 2: function DownSample(const Src: TMtxVec; Factor: Integer; SrcIndex: Integer; Index: Integer; Len: Integer; Phase: Integer): TMtxVec;

Downsamples object values.

#	Name	Type	Description
1	Src	TMtxVec	source TVec or TMtx
2	Factor	Integer
3	SrcIndex	Integer	source start index
4	Index	Integer	start index
5	Len	Integer	element count
6	Phase	Integer

Result: stored in self (calling object), returns self for chaining

Remarks:

Copy only every Factor sample from Src starting at SrcIndex up to Len to the calling object starting at Index. The phase parameter determines the initial sample offset. Phase must be less then Factor. Size and TMtxVec.Complex properties of the calling object are set implicitly. An exception is raised if array borders are overrun/underrun.