/[pspp]/pspp/doc/transformation.texi
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revision 1.6 by blp, Mon Mar 14 03:06:34 2005 UTC revision 1.7 by blp, Tue Mar 15 06:04:10 2005 UTC
# Line 527  are sorted in ascending order.  To overr Line 527  are sorted in ascending order.  To overr
527  for ascending order.  These apply to the entire list of variables  for ascending order.  These apply to the entire list of variables
528  preceding them.  preceding them.
529    
530    The sort algorithms used by @cmd{SORT CASES} are stable.  That is,
531    records that have equal values of the sort variables will have the
532    same relative order before and after sorting.  As a special case,
533    re-sorting an already sorted file will not affect the ordering of
534    cases.
535    
536  @cmd{SORT CASES} is a procedure.  It causes the data to be read.  @cmd{SORT CASES} is a procedure.  It causes the data to be read.
537    
538  @cmd{SORT CASES} attempts to sort the entire active file in main memory.  @cmd{SORT CASES} attempts to sort the entire active file in main memory.
539  If main memory is exhausted, it falls back to a merge sort algorithm that  If workspace is exhausted, it falls back to a merge sort algorithm that
540  involves writing and reading numerous temporary files.  involves creates numerous temporary files.
541    
542  @cmd{SORT CASES} may not be specified following TEMPORARY.    @cmd{SORT CASES} may not be specified following TEMPORARY.  
543  @setfilename ignored  @setfilename ignored

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