PLTMG Parameters

IFIRST Definitions

IFIRST	option
0	no initialization
1	initialize for piecewise linear elements
2	initialize for piecewise quadratic elements
3	initialize for piecewise cubic elements

IPROB Definitions

IPROB	problem option
1	elliptic boundary value problem
2	obstacle problem
3	continuation problem
4	parameter identification problem
5	optimal control problem
-1	DD solve for elliptic boundary value problem
-2	DD solve for obstacle problem
-3	DD solve for continuation problem
-4	DD solve for parameter identification problem
-5	DD solve for optimal control problem

ITASK Definitions

ITASK	IPROB	option
0	1	default
9		use functional
0	2	default
0	3	continue to the nearest target point
1		continue to the nearest target or singular point
2		switch branches at a bifurcation point
3		switch $\lambda$ and/or $\rho$ ; initialize with $\lambda$ fixed
4		switch $\lambda$ and/or $\rho$ ; initialize with $\rho$ fixed
5		solve with $\sigma=0$ , $\theta=0$ ($\lambda$ fixed)
6		solve with $\sigma=0$ , $\theta=2$ ($\rho$ fixed)
7		solve with $\sigma=0$ , $\theta=1$
0	4	default
8		switch $\lambda$ and initialize
0	5	default

ISPD Definitions

ISPD	storage/iteration options
0	nonsymmetric/biconjugate gradient
1	symmetric/conjugate gradient