Initializing help system before first use

qsort

qsort

Purpose
Sort a list or an array or (a subset of) the indices of an array.
Synopsis
procedure qsort(sense:boolean, lvals:list of integer|real)
procedure qsort(sense:boolean, lvals:list of string|text)
procedure qsort(sense:boolean, vals:array of integer|real)
procedure qsort(sense:boolean, vals:array of string|text)
procedure qsort(sense:boolean, vals:array of integer|real, ndx:array)
procedure qsort(sense:boolean, vals:array of string|text, ndx:array)
procedure qsort(sense:boolean, vals:array of integer|real, ndx:array, sel:set)
procedure qsort(sense:boolean, vals:array of string|text, ndx:array, sel:set)
procedure qsort(sense:boolean, vals:array of integer|real, lndx:list, sel:set)
procedure qsort(sense:boolean, vals:array of string|text, lndx:list, sel:set)
Arguments
sense 
Sense of the sorting:
SYS_UP 
Ascending order
SYS_DOWN 
Descending order
lvals 
List to be sorted
vals 
One-dimensional array to be sorted
ndx 
One-dimensional array of the same type and size as the indexing set of vals
lndx 
List of the same type as the indexing set of vals
sel 
Subset of the indexing set of vals
Example
The following example sorts an array of real numbers: 
declarations
 ar: array(1..10) of real
end-declarations

ar:: [1.2, -3, -8, 10.5, 4, 7, 2.9, -1, 0, 5]
qsort(true, ar)
writeln("Sorted array: ", ar)
Further information
1. In the first four versions of the procedure (with two arguments, sense and vals or lvals) the input array (list) vals ( lvals) is overwritten by the resulting sorted array (list).
2. When an array ndx is provided, the resulting sorted array is returned in the argument ndx in the form of its sorted index set. If a selection set sel of indices is provided, only the specified indices are processed.
3. When a list lndx is provided, the resulting sorted array is returned in the argument lndx in the form of a list of sorted indices. If a selection set sel of indices is provided, only the specified indices are processed.
4. When applied to a dynamic array this procedure processes all indices of the index set including those not referring to an existing cell (a subset of the indexing set sel can be used to select only the existing entries).
Module
mmsystem

Parent Topic Procedures and functions

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