dselect : call-back function
a : input rank-2 array(‘d’) with bounds (n,n)
Optional arguments:
compute_v := 1 input int
sort_t := 0 input int
dselect_extra_args := () input tuple
overwrite_a := 0 input int
lwork := 3*n input int
Return objects:
t : rank-2 array(‘d’) with bounds (n,n) and a storage
sdim : int
wr : rank-1 array(‘d’) with bounds (n)
wi : rank-1 array(‘d’) with bounds (n)
vs : rank-2 array(‘d’) with bounds (ldvs,n)
work : rank-1 array(‘d’) with bounds (MAX(lwork,1))
info : int