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Part(s) of an almost block-diagonal matrix
Syntax
[nb,rows,ncols,last,blocks] = bkbrk(blokmat) bkbrk(blokmat)
Description
bkbrk
is a utility used in slvblk
. It returns the details of the almost block-diagonal matrix contained in blokmat
, with rows
and last
nb
-vectors, and blocks
a matrix of size [sum(rows),ncols]
.
If there are no output arguments, nothing is returned but the details are printed out. This is of use when trying to understand what went wrong with such a matrix.
spcol
provides the spline collocation matrix in an almost block-diagonal form especially suited for splines, for use with slvblk
. But bkbrk
can also decode the almost block-diagonal form used in [1].
See Also
References
[1] C. de Boor and R. Weiss, "SOLVEBLOK: A package for solving almost block diagonal linear systems", ACM Trans. Mathem. Software 6 (1980), 80 - 87.
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