The Parameter IFLAG

IFLAG	general return codes
0	normal return
25	wrong input data structure
IFLAG	PLTMG and TRIGEN errors
1	zero pivot in sparse factorization
2	Newton method line search failed
6	illegal problem type
9	continuation procedure failed
10	multigraph iteration failed to converge
11	Newton (Newton/DD) iteration failed to converge
48	MPI was off for a command needing MPI
49	$NPROC>$NTF in load balance
71	no interface unknowns in DD solver
72	IPATH array not created
97	unmatched interface edges in IPATH
IFLAG	storage errors
18	storage exhausted in matrix array JA
19	storage exhausted in matrix array A
20	storage exhausted in work array W
21	storage exhausted in array ITNODE
22	storage exhausted in arrays VX and VY
23	storage exhausted in arrays XM and YM
24	storage exhausted in array IBNDRY
IFLAG	data errors for triangulation
$-31$	illegal ITNODE(K,*) $K=1,2,3$
$-32$	overlapping triangles in ITNODE
IFLAG	data errors for triangulation and skeleton
$-40$	illegal value for NVF, NCF, NTF, or NBF
$-41$	illegal IBNDRY(K,*) $K=1,2$
$-42$	illegal IBNDRY(3,*)
$-43$	illegal IBNDRY(4,*)
$-44$	incorrect circle center coordinates
$-45$	arc greater than $\pi/2$ in length
$-46$	error in linked edges
$-47$	boundary vertex without two boundary edges
$-48$	ITNODE and IBNDRY are not consistent
IFLAG	data errors for skeleton
$-51$	illegal ITNODE(1,*)
$-52$	illegal ITNODE(2,*)
$-53$	skeleton tracing error
$-54$	region specified in clockwise order
$-55$	illegal ITNODE(3,*)