Matrix.Trunc Method

Overload List

#	Signature	Description
1	function Trunc: TMtxVec;	Rounds a real number towards zero.
	└ indexed: function Trunc(Index: Integer; Len: Integer): TMtxVec;
2	function Trunc(const Src: TMtxVec): TMtxVec;	Truncate all Src object elements and store the results in calling object elements.
	└ indexed: function Trunc(const Src: TMtxVec; SrcIndex: Integer; Index: Integer; Len: Integer): TMtxVec;
3	procedure Trunc(var Dst: TIntegerArray);	Truncate all calling object elements and store the result in the Dst integer array.

Overload 1: function Trunc: TMtxVec;

Rounds a real number towards zero.

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

Remarks:

Rounds all calling object elements towards zero to an integer and stores the result in the calling object again as floating point numbers.

Examples

var
    a, expected: Matrix;
begin
    a := [[1.2, 2.7], [-0.5, 3.9]];
    a.Trunc;
    expected := [[1.0, 2.0], [-0.0, 3.0]];
    if not a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute) then
        raise Exception.Create('Matrix.Trunc: mismatch');
end;

See Also: Matrix.Frac, Matrix.Round

Indexed: function Trunc(Index: Integer; Len: Integer): TMtxVec;

Truncate calling object elements [Index]..[Index+Len-1] in-place.

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

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

Remarks:

An exception is raised if array borders are overrun/underrun.

Overload 2: function Trunc(const Src: TMtxVec): TMtxVec;

Truncate all Src object elements and store the results in calling object elements.

#	Name	Type	Description
1	Src	TMtxVec

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

Remarks:

Size and Matrix.Complex property of calling object are adjusted automatically.

Examples

var
    a, expected: Matrix;
begin
    a := [[1.2, 2.7], [-0.5, 3.9]];
    a.Trunc;
    expected := [[1.0, 2.0], [-0.0, 3.0]];
    if not a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute) then
        raise Exception.Create('Matrix.Trunc: mismatch');
end;

Indexed: function Trunc(const Src: TMtxVec; SrcIndex: Integer; Index: Integer; Len: Integer): TMtxVec;

Truncate Src object elements [SrcIndex]..[SrcIndex+Len-1].

#	Name	Type	Description
1	Src	TMtxVec
2	SrcIndex	Integer	source start index
3	Index	Integer	start index
4	Len	Integer	element count

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

Remarks:

Store the results to calling object elemenents [Index]..[Index+Len-1]. Size and Matrix.Complex property of calling object must be set explicitly to match those of Src object. An exception is raised if array borders are overrun/underrun.

Overload 3: procedure Trunc(var Dst: TIntegerArray);

Truncate all calling object elements and store the result in the Dst integer array.

#	Name	Type	Description
1	Dst	TIntegerArray

Result: stored in self (calling object)

Remarks:

Length of the array is automatically adjusted. If the calling object is Complex, the length of the Dst array is equal to 2*Matrix.Length.

Examples

var
    a, expected: Matrix;
begin
    a := [[1.2, 2.7], [-0.5, 3.9]];
    a.Trunc;
    expected := [[1.0, 2.0], [-0.0, 3.0]];
    if not a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute) then
        raise Exception.Create('Matrix.Trunc: mismatch');
end;