public void Dtpsv(StoredTriangle uplo, TransposeMatrix transA, DiagonalValues diag, int n,
double[] a, int offsetA, double[] x, int offsetX, int incX)
{
bool unit = (diag == DiagonalValues.Unit) ? true : false;
if (UseUpperImplementation(uplo, transA))
{
CblasLevel2Implementations.BackSubstitutionPackedColMajor(unit, n, a, offsetA, x, offsetX, incX);
}
else
{
CblasLevel2Implementations.ForwardSubstitutionPackedRowMajor(unit, n, a, offsetA, x, offsetX, incX);
}
}
public void Dtpmv(StoredTriangle uplo, TransposeMatrix transA, DiagonalValues diag, int n,
double[] a, int offsetA, double[] x, int offsetX, int incX)
{
// The copy may be avoidable in trangular operations, if we start the dot products from the bottom
var input = new double[x.Length];
Array.Copy(x, input, x.Length);
CblasLevel2Implementations.Diagonal managedDiag = (diag == DiagonalValues.NonUnit) ?
CblasLevel2Implementations.Diagonal.Regular : CblasLevel2Implementations.Diagonal.Unit;
if (UseUpperImplementation(uplo, transA))
{
CblasLevel2Implementations.UpperTimesVectorPackedColMajor(
managedDiag, n, 1.0, a, offsetA, input, offsetX, incX, 0.0, x, offsetX, incX);
}
else
{
CblasLevel2Implementations.LowerTimesVectorPackedRowMajor(
managedDiag, n, 1.0, a, offsetA, input, offsetX, incX, 0.0, x, offsetX, incX);
}
}
/// <summary>
/// See http://www.dotnumerics.com/NumericalLibraries/LinearAlgebra/CSharpCodeFiles/dtrsv.aspx
/// </summary>
public void Dtrsv(StoredTriangle uplo, TransposeMatrix transA, DiagonalValues diag, int n,
double[] a, int offsetA, int ldA, double[] x, int offsetX, int incX)
=> dtrsv.Run(uplo.Translate(), transA.Translate(), diag.Translate(), n, a, offsetA, ldA, ref x, offsetX, incX);
/// <summary>
/// See https://software.intel.com/en-us/mkl-developer-reference-fortran-trsv#D8733073-F041-4AA1-B82C-123DFA993AD7
/// </summary>
public void Dtrsv(StoredTriangle uplo, TransposeMatrix transA, DiagonalValues diag, int n,
double[] a, int offsetA, int ldA, double[] x, int offsetX, int incX)
=> Blas.Dtrsv(uplo.Translate(), transA.Translate(), diag.Translate(), ref n, ref a[offsetA], ref ldA,
ref x[offsetX], ref incX);
internal static string Translate(this DiagonalValues diag) => (diag == DiagonalValues.Unit) ? "U" : "N";
