hegv_comp_grp - Man Page

{he,sy}gst:     reduction to standard form
{he,sy}gs2:     reduction to standard form, level 2
{hp,sp}gst:     reduction to standard form, packed
{hb,sb}gst:     reduction to standard form, banded
pbstf:          split Cholesky factor, use with hbgst
lag2:           2x2 eig