Input

• b - Parallel array of the same type (real or complex) and precision as a. Must be distinct from a. The instance axes of b must match those of a in order of declaration and extents. The rows and columns of each B must be counted by axes row_axis and col_axis, respectively (from the S3L_lu_factor call). For the two-dimensional case, if b consists of only one right-hand side vector, you can represent b as a vector (an array of rank 1) or as an array of rank 2 with the number of columns set to 1 and the elements counted by axis row_axis.

• a - Parallel array that was factored by S3L_lu_factor, where each matrix instance A is a dense M x M square matrix. Supply the same value a that was used in S3L_lu_factor.

• setup_id - Scalar integer variable. Use the value returned by the corresponding S3L_lu_factor call for this argument.