ILMath.linsolveTriUp Method (InArray<Double>, InArray<Double>, Int32)

public static RetArray<double> linsolveTriUp(
	InArray<double> A,
	InArray<double> B,
	ref int singularityDetect
)

Public Shared Function linsolveTriUp ( 
	A As InArray(Of Double),
	B As InArray(Of Double),
	ByRef singularityDetect As Integer
) As RetArray(Of Double)

Dim A As InArray(Of Double)
Dim B As InArray(Of Double)
Dim singularityDetect As Integer
Dim returnValue As RetArray(Of Double)

returnValue = ILMath.linsolveTriUp(A, 
	B, singularityDetect)

Parameters

A

Type: ILNumerics.InArray<Double>
Input matrix. Size [n,n]. Upper triangular. No check is made for that!

B

Type: ILNumerics.InArray<Double>
Right hand side vector /matrix. Size [n,m].

singularityDetect

Type: System.Int32
[Output] This value gives the row of A, where a singularity has been detected (if any). If A is not singular, this will return a negative value.

Return Value

The solution is determined via backward substitution by using a native LAPACK module.

Make sure, A and B are of correct size, since no checks are made for that!

This function is used by linsolve(InArray<Double>, InArray<Double>, MatrixProperties, Boolean). It can speed up the computation for known, matching matrices, since it saves some checks on them which are otherwise automatically performed by linsolve(InArray<Double>, InArray<Double>, MatrixProperties, Boolean).

Any elements of A located below the main diagonal will be ignored.

If A is singular the array returned contains NaN values.

[ILNumerics Computing Engine]

Reference