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The band routines assume the matrix and are stored in LAPACK
band form. In the following we used AB and MB to denote
and B stored in band form. If the matrix has kl
subdiagonals and ku superdiagonals, then the ijth element of A
aij is stored in AB(kl+ku+1+i-j,j) for
. An example of a band matrix
with kl=2, ku=1 is illustrated below.
The elements marked * in the matrix AB need not be set.