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bipinpeter
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Joined: 18 Jun 2007
Posts: 213
Location: Cochin/Kerala/India
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Hi All,
Is any way to get all combinations of series of letters using REXX.
I meant that i have letters A,E,I,O,U.I want to create the all possible combinations using this letters.
For this is any inbuilt function or do i have to write the logic for this? |
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expat
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Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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It will be all down to you - based on your current description of the problem / request.
Maybe if you explained better and gave some example of what you want |
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bipinpeter
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Joined: 18 Jun 2007
Posts: 213
Location: Cochin/Kerala/India
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Example
I have the letters A,E,I,O,U. I want to create the all the combination of words using this letters.
Like
AEIOU
AEIUO
AEUIO
AUEIO
UAEIO............ etc
Now are you clear with my requirement? |
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dbzTHEdinosauer
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| do you want permutations or combinations? |
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bipinpeter
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Posts: 213
Location: Cochin/Kerala/India
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| i want combinations |
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dbzTHEdinosauer
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combinations would be:
AAAAA
AAAAE
AAAEE
whereas permutations means each letter can only be used once in the sequence.
so, which is it? |
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bipinpeter
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Location: Cochin/Kerala/India
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| i want combination a letter can repeat more than once in a word.Is it possible? |
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dbzTHEdinosauer
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| Quote: |
| i want combination a letter can repeat more than once in a word.Is it possible? |
sure it is.
what logic have you designed? or do you expect us to design, develop and then deliver the product to you?
develop some pseudo-code and someone can help you with the commands necessary. |
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bipinpeter
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Posts: 213
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| Still i didnt designed any logic.If you give some idea of logic,it will great help for me. |
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dbzTHEdinosauer
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Bipin, you tend to try solving your own problems, so I am not going to rant.
in fact, since it is so easy I am just going to give you the answer.
| Code: |
/* REXX */
stem1.0 = 5
stem1.1 = 'A'
stem1.2 = 'B'
stem1.3 = 'C'
stem1.4 = 'D'
stem1.5 = 'E'
stem2.0 = 5
stem2.1 = 'A'
stem2.2 = 'B'
stem2.3 = 'C'
stem2.4 = 'D'
stem2.5 = 'E'
stem3.0 = 5
stem3.1 = 'A'
stem3.2 = 'B'
stem3.3 = 'C'
stem3.4 = 'D'
stem3.5 = 'E'
stem4.0 = 5
stem4.1 = 'A'
stem4.2 = 'B'
stem4.3 = 'C'
stem4.4 = 'D'
stem4.5 = 'E'
stem5.0 = 5
stem5.1 = 'A'
stem5.2 = 'B'
stem5.3 = 'C'
stem5.4 = 'D'
stem5.5 = 'E'
outputstem. = ''
outputstem.0 = 1
/*then I would have a complex loop */
do r = 1 to stem1.0
do s = 1 to stem2.0
do t = 1 to stem3.0
do u = 1 to stem4.0
do v = 1 to stem5.0
j = outputstem.0
outputstem.j = stem1.r || stem2.s || stem3.t || stem4.u || stem5.v
outputstem.0 = outputstem.0 + 1
end
end
end
end
end
outputstem.0 = outputstem.0 - 1
say outputstem.0
do r = 1 to outputstem.0
say outputstem.r
end
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you will have to figure out how to output the results to a dataset. |
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bipinpeter
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Joined: 18 Jun 2007
Posts: 213
Location: Cochin/Kerala/India
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Thanks Dick,I got the logic which you given.This seems give the result which i expected.
Thanks alot |
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expat
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Posts: 8796
Location: Welsh Wales
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| Code: |
/* REXX *** CARTESIAN JOIN OVER 5 STEMS */
TRACE R
STM0.1 = 'A'
STM0.2 = 'E'
STM0.3 = 'I'
STM0.4 = 'O'
STM0.5 = 'U'
STM0.0 = 5
DO AA = 1 TO STM0.0
DO AB = 1 TO STM0.0
INTERPRET "STM"AA"."AB "= STM0."AB
END
END
DO AA = 1 TO STM0.0
DO AB = 1 TO STM0.0
DO AC = 1 TO STM0.0
DO AD = 1 TO STM0.0
DO AE = 1 TO STM0.0
OUTPUT = STM1.AA||STM2.AB||STM3.AC||STM4.AD||STM5.AE
SAY OUTPUT
END
END
END
END
END
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expat
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Damn ..... beaten to it by Dick "the fingers" Brenholtz  |
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bipinpeter
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Posts: 213
Location: Cochin/Kerala/India
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Expat you are great..(excuse me if you are not  )
I didnt get this statement
| Code: |
| INTERPRET "STM"AA"."AB "= STM0."AB |
What is this doing? |
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dbzTHEdinosauer
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expat, I may have been faster, but yours is a much better script.
Besides, my sequence is A B C D E instead of A E I O U
Dick "the fumbler" Brenholtz  |
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bipinpeter
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Posts: 213
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Dick and expat,
I think instead of using 5 different stems we can use one stem with 5 different indexes. |
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dbzTHEdinosauer
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dbzTHEdinosauer
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| bipinpeter wrote: |
Dick and expat,
I think instead of using 5 different stems we can use one stem with 5 different indexes. |
well, share your code. |
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bipinpeter
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Joined: 18 Jun 2007
Posts: 213
Location: Cochin/Kerala/India
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here is the code
| Code: |
* REXX */
stem1.0 = 5
stem1.1 = 'A'
stem1.2 = 'B'
stem1.3 = 'C'
stem1.4 = 'D'
stem1.5 = 'E'
outputstem. = ''
outputstem.0 = 1
/*then I would have a complex loop */
do r = 1 to stem1.0
do s = 1 to stem1.0
do t = 1 to stem1.0
do u = 1 to stem1.0
do v = 1 to stem1.0
j = outputstem.0
outputstem.j = stem1.r || stem1.s || stem1.t || stem1.u || stem5.v
outputstem.0 = outputstem.0 + 1
end
end
end
end
end
outputstem.0 = outputstem.0 - 1
say outputstem.0
do r = 1 to outputstem.0
say outputstem.r
end |
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expat
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Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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| bipinpeter wrote: |
Expat you are great..(excuse me if you are not )
I didnt get this statement
| Code: |
| INTERPRET "STM"AA"."AB "= STM0."AB |
What is this doing? |
Aaaaaaaah shucks
INTERPRET is a pretty powerful statement in REXX
The parts within the double quotes are literals, and the parts outside can be substituted by the current value of other variables.
For example
when using a value of 3 for AA, and 4 for AB becomes
STM3.4 = STM0.4
It is a great statement, I suggest you try doing that piece using TRACE R or TRACE I to follow it through. It's a great statement to have in the armoury, but it took me a couple of goes to get it right
| Code: |
TRACE R
DO AA = 1 TO STM0.0
DO AB = 1 TO STM0.0
INTERPRET "STM"AA"."AB "= STM0."AB
END
END
TRACE O
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dbzTHEdinosauer
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That's greate Bipin.
buuuuuuuuuuuuut, you have a typo:
outputstem.j = stem1.r || stem1.s || stem1.t || stem1.u || stem5.v
sorry, could not resist. |
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bipinpeter
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Joined: 18 Jun 2007
Posts: 213
Location: Cochin/Kerala/India
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| Yes Dick you are right |
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expat
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Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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Just for a laugh I tried to get this to work with a variable number of characters
Yeah, work is a little slow today
A bit cack-handed ....... but it does work 
| Code: |
/* REXX *** CARTESIAN JOIN OVER N STEMS
"ALTLIB DEACTIVATE APPL(EXEC)"
"ALTLIB ACTIVATE APPL(EXEC) DA('My REXX Library')"
"FREE FI(INDATA)"
"ALLOC FI(INDATA) DA('My REXX Library(CARTESA8)') SHR"
"EXECIO * DISKR INDATA ( STEM STM0. FINIS"
"FREE FI(INDATA)"
QUEUE """FREE FI(INDATA)"""
QUEUE """ALLOC FI(INDATA) DA('My REXX Library(CARTESA8)') SHR"""
QUEUE """EXECIO * DISKR INDATA ( STEM STM0. FINIS"""
QUEUE """FREE FI(INDATA)"""
QUEUE "DO AA = 1 TO STM0.0"
QUEUE " STM0.AA = STRIP(STM0.AA)"
QUEUE "END"
QUEUE "DO AA = 1 TO STM0.0"
QUEUE " DO AB = 1 TO STM0.0"
QUEUE ' INTERPRET "STM"AA"."AB "= STM0."AB '
QUEUE " END"
QUEUE "END"
"FREE FI(NEXREXX)"
"ALLOC FI(NEXREXX) DA('My REXX Library(CARTESA9)') SHR"
DO AA = 1 TO STM0.0
IF AA = 1 THEN DO
OUT = "/* TRACE R */"
QUEUE OUT
END
INTERPRET "OUT = 'DO A'"AA"' = 1 TO STM0.0'"
QUEUE OUT
END
"EXECIO" QUEUED() "DISKW NEXREXX"
DO AA = 1 TO STM0.0
IF AA = 1 THEN DO
OUT = "OUTPT = STM0.A"AA"|| ,"
QUEUE OUT
END
ELSE DO
IF AA = STM0.0 THEN DO
OUT = " STM0.A"AA
QUEUE OUT
OUT = "SAY OUTPT"
QUEUE OUT
END
ELSE DO
OUT = " STM0.A"AA"|| ,"
QUEUE OUT
END
END
END
DO AA = 1 TO STM0.0
OUT = "END"
QUEUE OUT
END
"EXECIO" QUEUED() "DISKW NEXREXX ( FINIS"
CALL CARTESA9
EXIT
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Pedro
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Joined: 01 Sep 2006
Posts: 2593
Location: Silicon Valley
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In Bipinpeter's example:
| Code: |
outputstem.0 = 1
...
j = outputstem.0
outputstem.j = stem1.r || stem1.s || stem1.t || stem1.u || stem5.v
outputstem.0 = outputstem.0 + 1
....
outputstem.0 = outputstem.0 - 1 |
I suggest starting with 0 and only incrementing when you have the next value. Then you do not need to subtract:
| Code: |
j = 0
...
j = j + 1
outputstem.j = stem1.r || stem1.s || stem1.t || stem1.u || stem1.v
....
outputstem.0 = j
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[/code] |
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