— Loadable Function: spparms ()
— Loadable Function: vals = spparms ()
— Loadable Function: [keys, vals] = spparms ()
— Loadable Function: val = spparms (key)
— Loadable Function: spparms (vals)
— Loadable Function: spparms ('defaults')
— Loadable Function: spparms ('tight')
— Loadable Function: spparms (key, val)

Sets or displays the parameters used by the sparse solvers and factorization functions. The first four calls above get information about the current settings, while the others change the current settings. The parameters are stored as pairs of keys and values, where the values are all floats and the keys are one of the strings

• spumoni Printing level of debugging information of the solvers (default 0)
• ths_rel Included for compatiability. Bot used. (default 1)
• ths_abs Included for compatiability. Bot used. (default 1)
• exact_d Included for compatiability. Bot used. (default 0)
• supernd Included for compatiability. Not used. (default 3)
• rreduce Included for compatiability. Not used. (default 3)
• wh_frac Inluded for compatiability. Not used. (default 0.5)
• autommd Flag whether the LU/QR and the '\' and '/' operators will automatically use the sparsity preserving mmd functions (default 1)
• autoamd Flag whether the LU and the '\' and '/' operators will automatically use the sparsity preserving amd functions (default 1)
• piv_tol The pivot tolerance of the UMFPACK solvers (default 0.1)
• bandden ?? (default 0.5)
• umfpack Flag whether the UMFPACK or mmd solvers are used for the LU, '\' and '/' operations (default 1)

The value of individual keys can be set with spparms (key, val). The default values can be restored with the special keyword 'defaults'. The special keyword 'tight' can be used to set the mmd solvers to attempt for a sparser solution at the potetial cost of longer running time.