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4
votes
0answers
56 views

Create an adequate 'training set' to train a ClassifierFunction which performs the role of the built-in `SubsetQ`

I am trying to "grow" my own SubsetQ function using Machine Learning methods. My cSubsetQ when given two lists (listA and ...
0
votes
1answer
33 views

Choosing sets from Subsets[list] part 2

Piggybacking off of this question, say if I wanted to exclude sets which weren't the union of elements of the list of lists. For example: ...
5
votes
5answers
145 views

Choosing sets from Subset[list]

Say I have a set, S, and I take Subsets[S] (the power set of S). For example: S={a,b,c} Subsets[S]={{}, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c}} How can ...
1
vote
2answers
133 views

Refining subset relations

People who do combinatorics (like me) are often faced with the following problem: For a list of combinatorial objects (vectors, permutations graphs,etc.), we know what multi-set of values it ...
-2
votes
2answers
102 views

How to efficiently find all sets of primes that add to a given number?

For large numbers the naive approach falls down: Select[Subsets[Range[1, 4]], PrimeQ@Total@# &] {{2},{3},{1,2},{1,4},{2,3},{3,4},{1,2,4}} ...
19
votes
5answers
655 views

How to delete subsets quickly?

I have some data like this: ...
2
votes
3answers
109 views

Efficient extraction of a subset

The context is molecular dynamics. The data is in the format (index_1, index_2, distance). The goal is to find all of the distances to the neighbors of point index_0 and to present a set listing the ...
2
votes
4answers
125 views

calculating subsets of a matrix (L=40X40)

I need to calculate all $k$-possible subsets$(k:1,L)$ of matrix with size $L$. I am using subset function as following, ...
1
vote
4answers
131 views

Find all disjoint subsets of equal length

Suppose that $A$ is a list with $n$ elements where $n$ is even. I want to write a function that returns all pairs $(A_1,A_2)$ where the sets $A_1$ and $A_2$ each have length $\frac{n}{2}$, $A_1 \cap ...
0
votes
1answer
123 views

How to subset datasets in Mathematica 10 [closed]

I'm sorry if this is obvious but I can't find a way to select only a certain amount of columns of a dataset (or delete a certain amount of columns from a dataset) using the key of each column. I ...
2
votes
2answers
89 views

Efficient subsetting and averaging

The following code aims to average 4 groups of the values vector. Which elements belong to each group is determined by the indic ...
5
votes
4answers
224 views

Signed power set of a list

Given {a, b, c, ...} with $n$ elements generate a list with $2^n$ elements. For example, if the list were {a, b, c}, then the ...
1
vote
4answers
183 views

Need an efficient way to do this list manipulation

Lets say i have two lists with me as given below: l1 = {4, 6, 8, 9, 10, 12}; l2 = {2, 3, 4, 5, 6, 7}; Now i have a function S2P(details irrelevant) which takes ...