tis: solve.tridiag – R documentation

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solve.tridiag

Solve a Tridiagonal System of Equations

This function solves the equation a %*% x = b for x, where a is tridiagonal and b can be either a vector or a matrix.

## S3 method for class 'tridiag'
solve(a, b, ...)

`a`	a `tridiag` object: a square tridiagonal (all zeroes except for the main diagonal and the diagonals immediately above and below it) matrix containing the coefficients of the linear system.
`b`	a vector or matrix giving the right-hand side(s) of the linear system. If missing, `b` is taken to be an identity matrix and the function will return the inverse of `a`.
`...`	ignored

Uses the LINPACK dgtsv routine.