I'm going to reply 2 or 3 separate answers ... otherwise it will get
confusing :-)
Sorry if this overloads anyone trying to delete or ignore the thread
message by message.
On 27/08/2014 21:15, Beat Cornaz wrote:
As for the Duplicates :
Alex wrote :
permut() is the optimized version - optimize simepl cases of 1 or 2 chars,
eliminate duplicates as we go.
Well, it does so, but not completely. First, as I discovered in my own script
with eliminating duplicates, it needs the input in the form of the most
duplicates in the beginning and then trailing off.
F.i. 111223 would work , but 112223 or 112333 would not return all of the
possible (non duplicate) permutations.
Hmmm - I can't see what it gets wrong in these cases.
Can you be specific about what is missed ? (maybe off-list)
Thanks.
Moreover, in the script of Alex, a couple of duplicates slip thru.
F.I. 1123 gives 14 permutations i.s.o. 12. In the list below, the # are the
doubles.
Yeah, sorry - bad optimization on my part.
The lines at fault were
case 2
put temp & CR & char 2 of temp & char 1 of temp into t2
break
and their equivalent at the head of the function. This misses the case
where the last two chars of the output string are the same (i.e. a
duplicate in the last two places). Update version of the function
enclosed below, changing those lines to
case 2
put temp into t2
if char 1 of temp <> char 2 of temp then put CR & char 2
of temp & char 1 of temp after t2
break
Full script follows below.
-- Alex.
function permut pMute
if the number of chars in pMute = 1 then return pMute
if the number of chars in pMute = 2 then
if char 1 of pMute = char 2 of pMute then
return pMute
else
return pMute & CR & char 2 of pMute & char 1 of pMute
end if
end if
put empty into t3
put empty into tDone
repeat with i = 1 to the number of chars in pMute
put char i of pMute into c
if c is among the chars of tDone then next repeat
put c after tDone
put pMute into temp
delete char i of temp
switch the the number of chars in temp
case 1
put temp into t2
break
case 2
put temp into t2
if char 1 of temp <> char 2 of temp then put CR & char 2
of temp & char 1 of temp after t2
break
default
put permut(temp) into t2
end switch
repeat for each line L in t2
put c & L & CR after t3
end repeat
end repeat
return t3
end permut
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