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Part(s) of almost block-diagonal matrix
Syntax
Description
[nb,rows,ncols,last,blocks] = bkbrk(blokmat)
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].
This utility program is not likely to be of interest to the casual user. It is used in slvblk to decode the information, provided by spcol, about a spline collocation matrix in an almost block diagonal form especially suited for splines. But bkbrk can also decode the almost block-diagonal form used in [1].
bkbrk(blokmat)
returns nothing, but the details are printed out. This is of use when trying to understand what went wrong with such a matrix.
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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