TMtx.Inv Method — Dew Math

Overload List

#	Signature	Description
1	TMtx Inv	Calculates matrix inverse (Mtx^-1).
	└ indexed: TMtxVec Inv(Int32 Index, Int32 Len)
2	TMtx Inv(TMtxType MtxType)	self = inverse of the matrix
3	TMtxVec Inv(TMtxVec X)	Calculate the inverse of all X object elements without limiting operating.
	└ indexed: TMtxVec Inv(TMtxVec X, Int32 XIndex, Int32 Index, Int32 Len)
4	TMtxVec Inv(TMtxVec X, Double Threshold)	Calculate the inverse of all X object elements anmd store the results to calling object elements.
	└ indexed: TMtxVec Inv(TMtxVec X, Double Threshold, Int32 XIndex, Int32 Index, Int32 Len)
5	TMtxVec Inv(Double Threshold)	Calculate the inverse of all calling object elements in-place. The computation occurs after first limiting the magnitude of each element by the lower bound of Threshold.
	└ indexed: TMtxVec Inv(Double Threshold, Int32 Index, Int32 Len)

Overload 1: TMtx Inv

Calculates matrix inverse (Mtx^-1).

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

Remarks:

Calculate the inverse (Mtx^-1) of the calling matrix. If the calling matrix is not Dew.Math.TMtx.Quadratic, an exception is raised. Parameter Dew.Math.TMtxType determines which optimized method will be used for calculating the inverse matrix. If MtxType is omitted, the default value mtGeneral (general quadratic matrix) is used.

Note
The MtxType parameter is not verified. To determine if the calling matrix type is actually MtxType, use the Dew.Math.TMtx.DetectMtxType method.

Examples

TMtx A;
MtxVec.CreateIt(out A);
try
    {
        A.SetIt(2,2,false,[1,2,
        2,4]);  // 2x2, real matrix
        A.Inv;
    }
finally
    {
        MtxVec.FreeIt(ref A);
    }

See Also: TMtx.DetectMtxType, TMtx.MtxError

Indexed: TMtxVec Inv(Int32 Index, Int32 Len)

Calculate the inverse of calling object elements [Index]..[Index+Len-1] 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/underrun.

Examples

Matrix a;
Matrix b;
a.SetIt(2,2,false,new double[] {1,2,3,4});  // a = new double[] {1, 2, 3, 4}
b.Inv(a,0.01); // b = new double[] {1.0, 0.5, 0.3333, 0.25}
b = Inv(a,0.01);

Overload 2: TMtx Inv(TMtxType MtxType)

Compute inverse of the matrix.

#	Name	Type	Description
1	MtxType	TMtxType

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

Remarks:

Specify the matrix type to select the most performance efficient algorithm.

Overload 3: TMtxVec Inv(TMtxVec X)

Calculate the inverse of all X object elements without limiting operating.

#	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 property of calling object are adjusted automatically.

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

Calculate the inverse of X object elements [XIndex]..[XIndex+Len-1] without limiting operating.

#	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 calling object elements [Index]..[Index+Len-1]. An exception is raised if X and calling object Dew.Math.TMtxVec.Complex property does not match or array borders are overrun/underrun.

Overload 4: TMtxVec Inv(TMtxVec X, Double Threshold)

Calculate the inverse of all X object elements anmd store the results to calling object elements.

#	Name	Type	Description
1	X	TMtxVec	source TVec or TMtx
2	Threshold	Double	scalar

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

Remarks:

Size and Dew.Math.TMtxVec.Complex property of calling obhect are adjusted automatically. The computation occurs after first limiting the magnitude of each element by the lower bound of Threshold. The limiting operation is performed to avoid division by zero. Since Threshold represents a magnitude, it is always real and must always be positive.

For complex versions, the magnitude of the input is limited, but the phase remains unchanged. Zero-valued input is assumed to have zero phase.

Indexed: TMtxVec Inv(TMtxVec X, Double Threshold, Int32 XIndex, Int32 Index, Int32 Len)

Calculate the inverse of X object elements [XIndex]..[XIndex+Len-1] after limiting the magnitude of each element by the lower bound of Threshold.

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

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

Remarks:

Store the results in calling object elements [Index]..[Index+Len-1]. An exception is raised if X and calling object Dew.Math.TMtxVec.Complex property do not match or array borders are overrun/underrun.

Overload 5: TMtxVec Inv(Double Threshold)

Calculate the inverse of all calling object elements in-place. The computation occurs after first limiting the magnitude of each element by the lower bound of Threshold.

#	Name	Type	Description
1	Threshold	Double	scalar

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

Remarks:

The limiting operation is performed to avoid division by zero. Since Threshold represents a magnitude, it is always real and must always be positive.

For complex versions, the magnitude of the input is limited, but the phase remains unchanged. Zero-valued input is assumed to have zero phase.

Indexed: TMtxVec Inv(Double Threshold, Int32 Index, Int32 Len)

Calculate the inverse of calling object elements [Index]..[Index+Len-1] in-place after limiting the magnitude of each element by the lower bound of Threshold.

#	Name	Type	Description
1	Threshold	Double	scalar
2	Index	Int32	start index
3	Len	Int32	element count

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

Remarks:

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