Block Tri-diagonal Matrix

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?

Answer 1

[John D'Errico]

It may be your lucky day. Just download my blktridiag code from the file exchange.

https://www.mathworks.com/matlabcentral/fileexchange/10603-block-tri-diagonal-matrices

It is designed to create a sparse block tridiagonal array, exactly what you will want.