mat_fold Interface Reference

Fold a sparse matrix to form a smaller sparse matrix. More...

Collaboration diagram for mat_fold:

Private Member Functions
subroutine	fold_ (from, nr, nc, to, single)

Detailed Description

Fold a sparse matrix to form a smaller sparse matrix.

Reduce the size of a sparse matrix by folding ir -> mod(ir-1, nnr) + 1 with nnr being the new number of rows.

If the folding reduces the matrix dimensions by half (for a matrix with even number of rows and columns) it will correspond to the following operation:

\begin{align*} \mathbf M_{\mathrm{old}} &= \begin{bmatrix} \mathbf A & \mathbf B \\{} \mathbf C & \mathbf D \end{bmatrix} \\{} \mathbf M_{\mathrm{new}} &= \mathbf A + \mathbf B + \mathbf C + \mathbf D \end{align*}

Both the number of rows and/or columns may changed individually.

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The documentation for this interface was generated from the following file:

• src/bud_SM_CSR.f90