       Select from Tuplet using logical expression

• To: mathgroup at smc.vnet.net
• Subject: [mg116804] Select from Tuplet using logical expression
• From: Lengyel Tamas <lt648 at hszk.bme.hu>
• Date: Tue, 1 Mar 2011 05:20:17 -0500 (EST)

```Hello.

Skip if needed:
///I am working on a part combinatorical problem with sets of 3
differently indexed values (e.g. F_i, F_j, F_k, F denoting frequency
channels) which are subsets of many values (e.g 16 different frequency
channels, denoted F_0, F_1 ... F_15).

Now, I need to select triplets from these channels, I used Tuplets. So far
so good. From these I need those combinations where indexes i!=k and/or
j!=k, and i=j is allowed (e.g {i,j,k} = {12, 12, 4} is a valid channel
combination, but {3, 12, 3} is not).///

So basically I need to generate triplets from a range of integer numbers,
where the first and second elements of these triplets do not match the
third. I thought Select would help, but I don't know if there exists an
option to control elements' values in a condition.

>From then on I must use these triplets' elements in a function.

But first I am asking your help in generating thos triplets of numbers.

Thanks.

Tamás Lengyel

```

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