# Tagged Questions

For questions about the functionality related to permutations in Mathematica.

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### Permutations[Range[12]] produces an error instead of a list

This input: Permutations[Range[12]] Results in this (error) output: ...
495 views

### Generating Tuples with restrictions

I am interested in a certain subset of all tuples. Generating all with Tuples and then filtering is wasteful, and will "blow up" very quickly. For a concrete ...
2k views

### How to apply a permutation to a symmetric square matrix?

Given a symmetric square matrix, how can I apply a permutation to the rows and columns (i.e. the same permutation to both the rows and the columns) such a way that the new structure of the matrix ...
566 views

### What is the fastest way to get the nth distinct permutation of a list?

What is the fastest way to write a function nthPermutation[xs_List, n_Integer] which is equivalent to Permutations[xs][[n]] but ...
2k views

### How to remove repeated permutations?

I want to get the Permutations on the elements of a list. Then I'm doing this: ...
411 views

### Equivalent Nested Loop Structure

Consider the following examples: ...
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### list of all permuations of sublists of a nested list

I've got a certain class of lists with, say, 4 elements, that are lists themselves. E.g. {{1, 2, 3}, {4}, {5, 6}, {7}}. I'd like to find a way to generate a list ...
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### What does the Combinatorica function: NumberOfPermutationsByType return?

I am using Mathematica 9. If I input: NumberOfPermutationsByType[{2, 2, 1, 1}] Mathematica returns 1/8. I was expecting <...
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### How to find the right permutation, which fits to the problem?

I'm new here and I hope I can find some help. I'm from Germany, so sorry for my English. I look for a number, whose digits are all different. It isn't known how many digits it has. But there is a rule:...
107 views

### How to get a new list by exchanging some elements?

Let's begin with a simple example. Now, we have a list, list0=Range[4]; k1 and k2 are some elements of the list0. If |k1-k2|==2, then the elements k1 and k2 can ...
250 views

### How to define even permutations correctly?

I define even permutations as following, but there may be some error. I use it in two different way and get different output. ...
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### Permutations on elements a>b && b>c

A={1, 2, 3, 4, 5} Permutations[A, {3}] I need to print all permutations where the first number is bigger than the second and the second number is bigger than the ...
187 views

### Permutations of 0's and 1's in a lower-triangular matrix

For a given $n \ge 5$ create every $n$-by-$n$ matrix containing exactly four $1$'s strictly below the diagonal and $0$'s elsewhere.
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### How to merge permutations obtained from Solve on multiple variables?

When I compute the following expression to find integer solutions of the equation (x^2 + y^2 + z^2 == 14^2) ...
95 views

### How can I filter a permutation list depending of a pattern? [closed]

I've created a permutation list Grid[Permutations[{a, e, q, r, t, u}], Frame -> All] and only want to see rows where the 5th element is a "t". I tried to do ...