– SuperLU routine (version 4.0) –
Lawrence Berkeley National Laboratory
June 30, 2009
int ilu_cpivotL |
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const int |
jcol, |
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const double |
u, |
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int * |
usepr, |
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int * |
perm_r, |
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int |
diagind, |
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int * |
swap, |
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int * |
iswap, |
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int * |
marker, |
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int * |
pivrow, |
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double |
fill_tol, |
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milu_t |
milu, |
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complex |
drop_sum, |
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GlobalLU_t * |
Glu, |
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SuperLUStat_t * |
stat |
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) |
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Purpose
Performs the numerical pivoting on the current column of L,
and the CDIV operation.
Pivot policy:
(1) Compute thresh = u * max_(i>=j) abs(A_ij);
(2) IF user specifies pivot row k and abs(A_kj) >= thresh THEN
pivot row = k;
ELSE IF abs(A_jj) >= thresh THEN
pivot row = j;
ELSE
pivot row = m;
Note: If you absolutely want to use a given pivot order, then set u=0.0.
Return value: 0 success;
i > 0 U(i,i) is exactly zero.