MaplePrimes - answers and comments on Question, Listing strings of length n composed of k given elements

combinat[permute]

Doug Meade — Fri, 06 Oct 2006 17:00:25 Z

Emrah, You should look at the permute command in the combinat package. Here is a possible solution to your request:

P := ( n::integer, symbols::list )
      -> combinat[permute]( [seq( s$n, s=symbols )], n );

Then, your example would be produced with:

P( 3, [0,1] );

You could also do something like

P( 5, [heads,tails] );

The only real "trick" in this solution is creating the list of symbols with n copies of each symbol. This is what is done with the seq command above. If you want to use the permute command elsewhere in a worksheet I recommend loading the combinat package by issuing the command

with( combinat );

Then you can refer to permute without explicit reference to combinat[permute]. I hope this is useful. Doug

---------------------------------------------------------------------
Douglas B. Meade
Math, USC, Columbia, SC 29208  E-mail: mailto:meade@math.sc.edu       
Phone:  (803) 777-6183         URL:    http://www.math.sc.edu/~meade/
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Thanks it really worked :-)

Emrah Akyar — Fri, 06 Oct 2006 17:07:04 Z

Thanks it really worked :-)

Generate strings

alec — Tue, 17 Oct 2006 13:30:43 Z

Also, StringTools package has Generate command that does exactly what you want (if you want strings),

s:=StringTools:-Generate(3,"01");

    s := ["000", "001", "010", "011", "100", "101", "110", "111"]

printf("%s",<s[]>);

000
001
010
011
100
101
110
111

une methode possible

xavier — Fri, 22 Jun 2007 14:15:20 Z

bonjour, j'ai crée la procédure frtot: frtot:=proc(s,n);l:=[seq([s[i]],i=1..nops(s))];for ki from 1 to n do l:=[seq(seq([op(l[i]),s[j]],j=1..nops(s)),i=1..nops(l))];if s[1]::list then [seq(matrix(l[k]),k=1..nops(l))] else l fi;od;end; n représente le nombre d'éléments k-1 par exemple on fait frtot([1,0],2); on obtient [[1, 1, 1], [1, 1, 0], [1, 0, 1], [1, 0, 0], [0, 1, 1], [0, 1, 0], [0, 0, 1], [0, 0, 0]]

language

DJKeenan — Fri, 22 Jun 2007 20:53:15 Z

인천 남구 용현동에 위치한 4년제 사립대학으로써, 1954년 인하공과대학으로 설립되어, 현재 공과대학·자연과학대학·경상대학·경영대학·사범대학·법과대학·사회과학 If postings are accepted in French, then how about other languages, such as Korean? My point is that it is not feasible for MaplePrimes readers to know the native languages of all Maple users. The only natural language that MaplePrimes readers can be assumed to know is English. Note 1: English is the language of international scientific discourse (I did not choose this, and would not have chosen English if I had the choice). Note 2: I have no idea what the Korean quote says.

other languages

roman_pearce — Fri, 22 Jun 2007 23:50:09 Z

I don't see the problem with people posting in other languages. It wouldn't be bad for MaplePrimes to attract a wider audience. Of course if you are posting a reply and you expect the person to understand it then it's probably best to use their language, but plenty of people can read French even if they would prefer not to look like an idiot trying to write it and there are lots of Japanese users of Maple too. If I'm really interested in what someone could be saying there are lots of automatic translation tools such as BabelFish. I would prefer not to exclude people who don't speak English, or don't speak it well enough to feel comfortable posting.