#! /usr/bin/env python3
#
def mv_st ( m, n, nz_num, row, col, a, x ):

#*****************************************************************************80
#
## MV_ST multiplies a sparse triple matrix times a vector.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    31 August 2014
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer M, N, the number of rows and columns.
#
#    Input, integer NZ_NUM, the number of nonzero values.
#
#    Input, integer ROW(NZ_NUM), COL(NZ_NUM), the row and column indices.
#
#    Input, real A(NZ_NUM), the nonzero values in the M by N matrix.
#
#    Input, real X(N), the vector to be multiplied.
#
#    Output, real B(M), the product A*X.
#
  import numpy as np

  b = np.zeros ( m )

  for k in range ( 0, nz_num ):
    b[row[k]] = b[row[k]] + a[k] * x[col[k]]

  return b