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A
double[][] A
Compact store of band matrix as A[0, n-1][0, m1+m2].
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n
int n
The size of matrix.
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m1
int m1
The number of subdiagonal rows.
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m2
int m2
The number of superdiagonal rows.
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au
double[][] au
The upper triangular matrix of LU decomposition.
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al
double[][] al
The lower triangular matrix of LU decomposition.
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index
int[] index
index[0,n-1] records the row permutation effected by the partial pivoting.
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d
double d
d is +/-1 depending on whether the number of row interchanges was even
or odd. respectively.