Sorts numbers in increasing or decreasing order.
call slasrt( id, n, d, info )
call dlasrt( id, n, d, info )
The routine ?lasrt sorts the numbers in d in increasing order (if id = 'I') or in decreasing order (if id = 'D'). It uses Quick Sort, reverting to Insertion Sort on arrays of size ≤ 20. Dimension of stack limits n to about 232.
CHARACTER*1.
= 'I': sort d in increasing order;
= 'D': sort d in decreasing order.
INTEGER. The length of the array d.
REAL for slasrt
DOUBLE PRECISION for dlasrt.
On entry, the array to be sorted.
On exit, d has been sorted into increasing order
(d(1) ≤ ... ≤ d(n)) or into decreasing order
(d(1) ≥ ... ≥ d(n)), depending on id.
INTEGER.
= 0: successful exit
< 0: if info = -i, the i-th argument had an illegal value.