ScriptIntrinsicBLAS.DSBMV Method

Definition

Namespace:

Android.Renderscripts

Assembly:

Mono.Android.dll

DSBMV performs the matrix-vector operation y := alphaAx + beta*y

[Android.Runtime.Register("DSBMV", "(IIDLandroid/renderscript/Allocation;Landroid/renderscript/Allocation;IDLandroid/renderscript/Allocation;I)V", "", ApiSince=23)]
public void DSBMV (int Uplo, int K, double alpha, Android.Renderscripts.Allocation? A, Android.Renderscripts.Allocation? X, int incX, double beta, Android.Renderscripts.Allocation? Y, int incY);

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

Parameters

Uplo

Int32

Specifies whether the upper or lower triangular part of the band matrix A is being supplied.

K

Int32

The number of off-diagonals of the matrix A

alpha

Double

The scalar alpha.

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.

beta

Double

The scalar beta.

Y

Allocation

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

incY

Int32

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

Attributes

RegisterAttribute

Remarks

DSBMV performs the matrix-vector operation y := alpha*A*x + beta*y

Details: http://www.netlib.org/lapack/explore-html/d8/d1e/dsbmv_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.DSBMV(int, int, double, android.renderscript.Allocation, android.renderscript.Allocation, int, double, 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.