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Block Tri-diagonal Matrix

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In the process of a solvng a system of coupled pdes I have finally got a block tri-diagonal matrix. How to write the whole matrix in MATLAB. Is there any built in function to write such kind of block tri-diagonal matrix?

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Accepted Answer

John D'Errico
John D'Errico on 11 Jul 2020
Edited: John D'Errico on 11 Jul 2020
It may be your lucky day. Just download my blktridiag code from the file exchange.
It is designed to create a sparse block tridiagonal array, exactly what you will want.

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