##### 22.6.2.51 symbfact

— Loadable Function: [count, h, parent, post, r] = symbfact (s, typ, mode)

> Performs a symbolic factorization analysis on the sparse matrix s. Where

> s
>   s is a complex or real sparse matrix.
> typ
>   Is the type of the factorization and can be one of
>   `sym`
>     Factorize s. This is the default.
>   `col`
>     Factorize s`' *` s.
>   `row`
>     Factorize s`*` s`'`.
>   `lo`
>     Factorize s`'`
> mode
>   The default is to return the Cholesky factorization for r, and if mode is 'L', the conjugate transpose of the Choleksy factorization is returned. The conjugate transpose version is faster and uses less memory, but returns the same values for count, h, parent and post outputs.

> The output variables are

> count
>   The row counts of the Cholesky factorization as determined by typ.
> h
>   The height of the elimination tree.
> parent
>   The elimination tree itself.
> post
>   A sparse boolean matrix whose structure is that of the Cholesky factorization as determined by typ.