Vector.Cos Method

Overload List

#	Signature	Description
1	function Cos: TMtxVec;	Cosine.
	└ indexed: function Cos(Index: Integer; Len: Integer): TMtxVec;
2	function Cos(const X: TMtxVec): TMtxVec;	Calculate the cosine of all X object elements
	└ indexed: function Cos(const X: TMtxVec; XIndex: Integer; Index: Integer; Len: Integer): TMtxVec;

Overload 1: function Cos: TMtxVec;

Cosine.

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

Remarks:

Calculate the cosine of all caling object elements in-place.

Examples

var a: Vector;
begin
    a.SetIt(True,[1,-2,3,4]);
    a.Cos; // Computes complex sine
end;

var
    a, expected: Vector;
begin
    a := [0.0, 0.523598775598299, 0.785398163397448, 1.0471975511966];
    a.Cos;
    expected := [1.0, 0.866025403784439, 0.707106781186548, 0.5];
    if not a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute) then
        raise Exception.Create('Vector.Cos: mismatch');
end;

See Also: Vector.ArcCos, Vector.SinCos

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

Calculate the cosine of 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.

Overload 2: function Cos(const X: TMtxVec): TMtxVec;

Calculate the cosine of all X object elements

#	Name	Type	Description
1	X	TMtxVec

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

Remarks:

store the results in the calling object. Size and Vector.Complex properties of calling object are adjusted automatically.

Examples

var
    a, x, expected: Vector;
begin
    x := [0.0, 0.523598775598299, 0.785398163397448, 1.0471975511966];
    a.Cos(x);
    expected := [1.0, 0.866025403784439, 0.707106781186548, 0.5];
    if not a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute) then
        raise Exception.Create('Vector.Cos: mismatch');
end;

Indexed: function Cos(const X: TMtxVec; XIndex: Integer; Index: Integer; Len: Integer): TMtxVec;

Calculate the cosine of X object elements [XIndex]...[XIndex+Len-1].

#	Name	Type	Description
1	X	TMtxVec
2	XIndex	Integer	X start index
3	Index	Integer	start index
4	Len	Integer	element count

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

Remarks:

The results are stored in calling object elements [Index]...[Index+Len-1]. Size and Vector.Complex properties of calling object and the calling object must be set explicitly. An exception is raised if array borders are overrun.