f03bhc computes the determinant of an
$n$ by
$n$ symmetric positive definite banded matrix
$A$ that has been stored in band-symmetric storage.
f07hdc must be called first to supply the Cholesky factorized form. The storage (upper or lower triangular) used by
f07hdc is relevant as this determines which elements of the stored factorized form are referenced.
The accuracy of the determinant depends on the conditioning of the original matrix. For a detailed error analysis see page 54 of
Wilkinson and Reinsch (1971).
This example calculates the determinant of the real symmetric positive definite band matrix