f01va copies a real triangular matrix, stored in full format in a two-dimensional array, to a standard packed format in a one-dimensional array.
Syntax
C# |
---|
public static void f01va( string uplo, int n, double[,] a, double[] ap, out int info ) |
Visual Basic |
---|
Public Shared Sub f01va ( _ uplo As String, _ n As Integer, _ a As Double(,), _ ap As Double(), _ <OutAttribute> ByRef info As Integer _ ) |
Visual C++ |
---|
public: static void f01va( String^ uplo, int n, array<double,2>^ a, array<double>^ ap, [OutAttribute] int% info ) |
F# |
---|
static member f01va : uplo : string * n : int * a : float[,] * ap : float[] * info : int byref -> unit |
Parameters
- uplo
- Type: System..::..StringOn entry: specifies whether is upper or lower triangular.
- is upper triangular.
- is lower triangular.
Constraint: or .
- n
- Type: System..::..Int32On entry: , the order of the matrix .Constraint: .
- a
- Type: array<System..::..Double,2>[,](,)[,][,]An array of size [dim1, dim2]Note: dim1 must satisfy the constraint:Note: the second dimension of the array a must be at least .On entry: the triangular matrix .
- If , is upper triangular and the elements of the array below the diagonal are not referenced.
- If , is lower triangular and the elements of the array above the diagonal are not referenced.
- ap
- Type: array<System..::..Double>[]()[][]An array of size []On exit: the by triangular matrix .
- info
- Type: System..::..Int32%On exit: unless the method detects an error (see [Error Indicators and Warnings]).
Description
f01va packs a real by triangular matrix , stored conventionally in a two-dimensional array, into a one-dimensional array of length . The matrix is packed by columns. This method is intended for possible use in conjunction with methods from f06 f07 f08 f16 where some methods use triangular matrices stored in the packed form.
Packed storage format is described in recomm_32 in f07.
References
None.
Error Indicators and Warnings
Some error messages may refer to parameters that are dropped from this interface
(LDA) In these
cases, an error in another parameter has usually caused an incorrect value to be inferred.
- If , argument had an illegal value. An explanatory message is output, and execution of the program is terminated.
Accuracy
Not applicable.
Parallelism and Performance
None.
Further Comments
None.
Example
This example reads in a triangular matrix and copies it to packed format.
Example program (C#): f01vae.cs