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Re: simple cipher


On 3/20/05 at 4:11 AM, chocolatez at gmail.com (zak) wrote:

>s1 = {1, 0, 1, 0, 0, 1, 0, 1}
>s2 = {L, r, o, w, e, v, y, e}

>s1 is a kind of a sieve i want to look through to s2, so i could
>pick every letter in s2 wich correspond to every digit=1 in s1 so i
>could obtain the word "love", this is like the trivial ciphers we
>know in our childhood, i have the following approach, i hope there
>is other versions.

>p = Flatten[Position[s1, 1]]
>out[]= {1, 3, 6, 8}

>str = ""; 
>Do[str = StringJoin[str, ToString[s2[[p[[i]]]]]], {i, 1,4}]
>str

>Out[]= Love

With version 5.1 this could be done as

str=StringJoin@@(ToString/@Pick[s2,s1,1])

And with earlier versions the Do loop can be eliminated with

str = StringJoin@@(ToString/@s2[[p]])
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