__Function:__int**gsl_linalg_solve_symm_tridiag***(const gsl_vector **`diag`, const gsl_vector *`e`, const gsl_vector *`b`, gsl_vector *`x`)-
This function solves the general @math{N}-by-@math{N} system @math{A x =
b} where
`A`is symmetric tridiagonal. The form of`A`for the 4-by-4 case is shown below,

__Function:__int**gsl_linalg_solve_symm_cyc_tridiag***(const gsl_vector **`diag`, const gsl_vector *`e`, const gsl_vector *`b`, gsl_vector *`x`)-
This function solves the general @math{N}-by-@math{N} system @math{A x =
b} where
`A`is symmetric cyclic tridiagonal. The form of`A`for the 4-by-4 case is shown below,

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