TVec.Sign Method — Dew Math

Overload List

#	Signature	Description
1	TMtxVec Sign	Changes elements sign.
	└ indexed: TMtxVec Sign(Int32 Index, Int32 Len)
2	TMtxVec Sign(TMtxVec X)	Change all X object elements sign.
	└ indexed: TMtxVec Sign(TMtxVec X, Int32 XIndex, Int32 Index, Int32 Len)

Overload 1: TMtxVec Sign

Changes elements sign.

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

Remarks:

Changes all calling object elements sign (v -> -v) in-place.

Examples

Vector a = new Vector();
a.SetIt(new double[] { -3.0, -1.0, 1.0, 2.0 });
a.Sign();
Vector expected = new Vector();
expected.SetIt(new double[] { 3.0, 1.0, -1.0, -2.0 });
if (!a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute))
    throw new Exception("Vector.Sign: mismatch");

Vector a;
a.SetIt(false,new double[] {1,2,-3,4});
a.Sign; // a = new double[] {-1,-2,3,-4}

Indexed: TMtxVec Sign(Int32 Index, Int32 Len)

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

#	Name	Type	Description
1	Index	Int32	start index
2	Len	Int32	element count

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

Remarks:

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

Overload 2: TMtxVec Sign(TMtxVec X)

Change all X object elements sign.

#	Name	Type	Description
1	X	TMtxVec	source TVec or TMtx

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

Remarks:

Store the results in calling object. Size and Dew.Math.TMtxVec.Complex properties of calling object are adjusted automatically.

Examples

Vector a = new Vector();
Vector x = new Vector();
x.SetIt(new double[] { -3.0, -1.0, 1.0, 2.0 });
a.Sign(x);
Vector expected = new Vector();
expected.SetIt(new double[] { 3.0, 1.0, -1.0, -2.0 });
if (!a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute))
    throw new Exception("Vector.Sign: mismatch");

Indexed: TMtxVec Sign(TMtxVec X, Int32 XIndex, Int32 Index, Int32 Len)

Change X object elements [XIndex]..[XIndex+Len-1] sign.

#	Name	Type	Description
1	X	TMtxVec	source TVec or TMtx
2	XIndex	Int32	X start index
3	Index	Int32	start index
4	Len	Int32	element count

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

Remarks:

Store the results in callingobject elements [Index]..[Index+Len-1]. An exception is raised if array borders are overrun or underrun.