LARSCL2 - 5.2 English - 68552

LARSCL2 performs reciprocal diagonal scaling on a vector.

Purpose:

 LARSCL2 performs a reciprocal diagonal scaling on an vector:
   x <-- inv(D) * x
 where the diagonal matrix D is stored as a vector.

 Eventually to be replaced by BLAS_sge_diag_scale in the new BLAS
 standard.

Parameters:

• M – [in]

  M is INTEGER

  The number of rows of D and X. M >= 0.

• N – [in]

  N is INTEGER

  The number of columns of X. N >= 0.

• D – [in]

  D is REAL array, length M

  Diagonal matrix D, stored as a vector of length M.

• X – [inout]

  X is REAL array, dimension (LDX,N)

  On entry, the vector X to be scaled by D. On exit, the scaled vector.

• LDX – [in]

  LDX is INTEGER

  The leading dimension of the vector X. LDX >= M.