MATLAB: Block Tri-diagonal Matrix

block tri-diagonal matrixlinear algebra

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?

Best Answer

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.

Related Solutions

MATLAB: Inversion of block tridiagonal matrices

If you have a small enough problem which is not ill-conditioned just use \, if it is ill-conditioned but you can do an SVD of your matrix, I suggest using that decomposition and a Tikhonov-type solution. If the matrix is too big then you might find some suitable iterative solver: matlabs iterative solvers.

HTH

MATLAB: Change diagonal place

a= magic(3)
a =
       8     1     6
       3     5     7
       4     9     2
>> b=a;
>>  for i =2:size(a,1)
b(i,1:i)= fliplr(a(i,1:i));
end
b
b =
       8     1     6
       5     3     7
       2     9     4

Best Answer

Related Solutions

MATLAB: Inversion of block tridiagonal matrices

MATLAB: Change diagonal place

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