2.3.1 Common Arguments

The solver routines share many common arguments. A description of these follows.

• b - source vector
  • Intent: In
  • Type: Real array (1:ia(_JT_ nunk_) )
  • Currently, _JT_nunk_ = 2.

• a - coefficient matrix values
  • Type: Real array
  • Intent: In

• ia - integer vector containing info about how a is stored
  • Type: Integer array (1:_JT_no_of_storage_parameters_)
  • Intent: In
  • Currently, _JT_no_of_storage_parameters_ = 8

• ja - integer map for coefficient
  • Type: Integer array
  • Intent: In
• iparm - integer control and informational parameters
  • Type: Integer array (1:_JT_no_of_iparms_)
  • Intent: In/Out
  • Currently, _JT_no_of_iparms_ = 14
• rparm - rank-1 array of floating-point control and informational parameters
  • Type: Real array (1:_JT_no_of_rparms_)
  • Intent: In/Out
  • Currently, _JT_no_of_rparms_ = 5

• x - solution vector
  • Type: Real array (1:ia(_JT_ nunk_) )
  • Intent: In/out
  • Value of x on entry is used as initial guess.
  • Currently, _JT_nunk_ = 2.
• cpu - cumulative CPU time after each iterate
  • Type: Real array (0:iparm(_JT_ itmax_))
  • Intent: Out
  • Currently, _JT_itmax_ = 6.
• rnormt - norm of true residual
  • Type: Real array (0:iparm(_JT_ itmax_))
  • Intent: Out
  • Currently, _JT_itmax_ = 6.

• errt - error estimate based on true residual
  • Type: Real array (0:iparm(_JT_ itmax_))
  • Intent: Out
  • Currently, _JT_itmax_ = 6.

• err - error estimate at each iteration
  • Type: Real array (0:iparm(_JT_ itmax_))
  • Intent: Out
  • Currently, _JT_itmax_ = 6.

• status - return status
  • Type: Real scalar
  • Intent: In/Out