Description Usage Arguments Value See Also
This function computes triangular matrix-vector multipication x = op(A) x by using CUDA cublas function cublasDtrmv
1 | trmvgpu(fillmode = 1, trans = 1, diagmode = 1, A, x)
|
fillmode |
indicates if matrix A lower or upper part is stored, the other part is not referenced and is inferred from the stored elements. if fillmode == 1 then the triagular banded matrix A is stored column by column, with the main diagonal of the matrix stored in row 1, the first subdiagonal in row 2 (starting at first position), the second subdiagonal in row 3 (starting at first position), etc. if fillmode == 2 then the triangular banded matrix A is stored column by column, with the main diagonal of the matrix stored in row k+1, the first superdiagonal in row k (starting at second position), the second superdiagonal in row k-1 (starting at third position), etc. |
trans |
matrix A transpose operator, 1 (non-transpose), 2 (transpose), 3 (conjugate transpose); default at 1 (non-transpose) |
diagmode |
indicates whether the main diagonal of the matrix A is unity and consequently should not be touched or modified by the function. if diagmode = 1, the matrix diagonal has non-unit elements, if diagmode = 2, the matrix diagonal has unit elements |
A |
input matrix; list of R external GPU pointer and dimension |
x |
input/output vector; list of R external GPU pointer and dimension |
updated vector x, a list consisting of
ptr: GPU pointer
m: length of vector x
n: 1
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