block tridiagonal
Can anyone tell me or send me a code "fortran" for solving a blocktridiagonal matrix?

Efficient Block tridiagonal matrix solver
Can anyone tell me which algorithm is more efficient and precise for solving the blocktridiagonal matrix? The LU decompostion algorithm or the Thoma algorithm (for the Thomas algorithm we need to calculate a matrix inverse )

dear george，
you can deal it with matlab,just type the code 
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