ScriptIntrinsicBLAS.DTBMV Method

Definition

Namespace:

Android.Renderscripts

Assembly:

Mono.Android.dll

DTBMV performs one of the matrix-vector operations x := Ax or x := A**Tx

[Android.Runtime.Register("DTBMV", "(IIIILandroid/renderscript/Allocation;Landroid/renderscript/Allocation;I)V", "", ApiSince=23)]
public void DTBMV (int Uplo, int TransA, int Diag, int K, Android.Renderscripts.Allocation? A, Android.Renderscripts.Allocation? X, int incX);

[<Android.Runtime.Register("DTBMV", "(IIIILandroid/renderscript/Allocation;Landroid/renderscript/Allocation;I)V", "", ApiSince=23)>]
member this.DTBMV : int * int * int * int * Android.Renderscripts.Allocation * Android.Renderscripts.Allocation * int -> unit

Parameters

Uplo

Int32

Specifies whether the matrix is an upper or lower triangular matrix.

TransA

Int32

The type of transpose applied to matrix A.

Diag

Int32

Specifies whether or not A is unit triangular.

K

Int32

The number of off-diagonals of the matrix A

A

Allocation

The input allocation contains matrix A, supported elements type Element#F64.

X

Allocation

The input allocation contains vector x, supported elements type Element#F64.

incX

Int32

The increment for the elements of vector x, must be larger than zero.

Attributes

RegisterAttribute

Remarks

DTBMV performs one of the matrix-vector operations x := A*x or x := A**T*x

Details: http://www.netlib.org/lapack/explore-html/df/d29/dtbmv_8f.html

Note: For a N*N matrix, the input Allocation should also be of size N*N (dimY = N, dimX = N), but only the region N*(K+1) will be referenced. The following subroutine can is an example showing how to convert a UPPER trianglar matrix 'a' to row-based band matrix 'b'. for i in range(0, n): for j in range(i, min(i+k+1, n)): b[i, j-i] = a[i, j]

Java documentation for android.renderscript.ScriptIntrinsicBLAS.DTBMV(int, int, int, int, android.renderscript.Allocation, android.renderscript.Allocation, int).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.