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ScriptIntrinsicBLAS.DSPR2 Method

  • Reference

Definition

Namespace:
Android.Renderscripts
Assembly:
Mono.Android.dll

DSPR2 performs the symmetric rank 2 operation A := alphaxyT + alphayxT + A

[Android.Runtime.Register("DSPR2", "(IDLandroid/renderscript/Allocation;ILandroid/renderscript/Allocation;ILandroid/renderscript/Allocation;)V", "", ApiSince=23)]
public void DSPR2 (int Uplo, double alpha, Android.Renderscripts.Allocation? X, int incX, Android.Renderscripts.Allocation? Y, int incY, Android.Renderscripts.Allocation? Ap);
[<Android.Runtime.Register("DSPR2", "(IDLandroid/renderscript/Allocation;ILandroid/renderscript/Allocation;ILandroid/renderscript/Allocation;)V", "", ApiSince=23)>]
member this.DSPR2 : int * double * Android.Renderscripts.Allocation * int * Android.Renderscripts.Allocation * int * Android.Renderscripts.Allocation -> unit

Parameters

Uplo
Int32

Specifies whether the upper or lower triangular part is to be supplied in the packed form.

alpha
Double

The scalar alpha.

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.

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.

Ap
Allocation

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

Attributes
RegisterAttribute

Remarks

DSPR2 performs the symmetric rank 2 operation A := alpha*x*y**T + alpha*y*x**T + A

Details: http://www.netlib.org/lapack/explore-html/dd/d9e/dspr2_8f.html

Note: For a N*N matrix, the input Allocation should be a 1D allocation of size dimX = N*(N+1)/2, The following subroutine can is an example showing how to convert a UPPER trianglar matrix 'a' to packed matrix 'b'. k = 0 for i in range(0, n): for j in range(i, n): b[k++] = a[i, j]

Java documentation for android.renderscript.ScriptIntrinsicBLAS.DSPR2(int, double, android.renderscript.Allocation, int, android.renderscript.Allocation, int, android.renderscript.Allocation).

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.

Applies to