Developer Reference for Intel® oneAPI Math Kernel Library for Fortran
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?lapst
Sorts the numbers in increasing or decreasing order.
Syntax
call slapst (id, n, d, indx, info )
call dlapst (id, n, d, indx, info )
Description
?lapst is a modified version of the LAPACK routine ?lasrt.
Define a permutation indx that sorts the numbers in d in increasing order (if id = 'I') or in decreasing order (if id = 'D' ).
Use Quick Sort, reverting to Insertion sort on arrays of size <= 20. Dimension of STACK limits n to about 232.
Input Parameters
- id
-
CHARACTER*1.
= 'I': sort d in increasing order;
= 'D': sort d in decreasing order.
- n
-
INTEGER.
The length of the array d.
- d
-
REAL for slapst
DOUBLE PRECISION for dlapst
Array, size (n)
The array to be sorted.
Output Parameters
indx |
INTEGER. Array, size (n). The permutation which sorts the array d. |
info |
INTEGER. = 0: successful exit < 0: if info = -i, the i-th argument had an illegal value |