TVecInt.Reverse Method

Overload List

#	Signature	Description
1	function Reverse: TVecInt;	Reverse vector elements.
	└ indexed: function Reverse(Index: Integer; Len: Integer): TMtxVecInt;
2	function Reverse(Vec: TMtxVecInt): TVecInt;	Reverse all Vec elements.
	└ indexed: function Reverse(Vec: TMtxVecInt; VecIndex: Integer; Index: Integer; Len: Integer): TMtxVecInt;

Overload 1: function Reverse: TVecInt;

Reverse vector elements.

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

Remarks:

The method reverses vector elements by using the following equation:

\text{V}[k]=\text{Vec}[N-k],\quad 0\leq k \leq N, \quad \text{where } N=\text{Vec.Length}-1

This overload reverses all calling vector elements in-place.

Examples

var a: TVecInt;
begin
    CreateIt(a);
    try
        a.SetIt([1,2,3,4]);
        a.Reverse;   // a = [4,3,2,1]
    finally
        FreeIt(a);
    end;
end;

See Also: TVecInt.Rotate, TVecInt.Shift

Indexed: function Reverse(Index: Integer; Len: Integer): TMtxVecInt;

Reverses the calling object elements [Index]..[Index+Len-1].

#	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 Reverse(Vec: TMtxVecInt): TVecInt;

Reverse all Vec elements.

#	Name	Type	Description
1	Vec	TMtxVecInt	source TVecInt or TMtxInt

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

Remarks:

Xtore the result in the calling vector elements. The TMtxVecBase.Length property of the calling vector are set implicitly to match Vec vector.

Examples

var a: TMtxInt;
begin
    CreateIt(a);
    try
        a.SetIt(2,2,[1,2,3,4]);
        a.Reverse(0,2);   // a = [2,1,3,4]
    finally
        FreeIt(a);
    end;
end;

Indexed: function Reverse(Vec: TMtxVecInt; VecIndex: Integer; Index: Integer; Len: Integer): TMtxVecInt;

Reverse vector elements.

#	Name	Type	Description
1	Vec	TMtxVecInt	source TVecInt or TMtxInt
2	VecIndex	Integer
3	Index	Integer	start index
4	Len	Integer	element count

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

Remarks:

The method reverses Vec vector elements from [VecIndex].. [VecIndex+Len-1] and stores them in the calling vector from [Index]...[Index+Len-1] by using the following equation:

\text{V}[k]=\text{Vec}[N-k],\quad 0\leq k \leq N, \quad \text{where } N=\text{Vec.Length}-1

This overload reverses calling vector elements in-place.

Examples

var
    a: TVecInt;
begin
MtxVecInt.CreateIt(out a);
try
a.SetIt(new int[] {1,2,3,4});
a.Reverse;   // a = [4,3,2,1]
finally
MtxVecInt.FreeIt(ref a);
end;
end;