Etc.). CHOLMOD, UMFPACK and qr factorization are some of the options.
If the matrix is sparse and symmetric positive definite, but has a very narrow band, then a specialized band solver is used. Most matrices do not have a narrow enough band to trigger this condition. Typically, this comes up with 1D splines in the Spline Toolbox.
2D problems have a large 'band' (they are not truly banded matrices).
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