Questions tagged [pattern-matching]
The pattern-matching tag has no usage guidance.
12 questions
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Why does this Moiré pattern look this way?
I was making some gifs of Mobius transformations in Matlab, and some strange patterns began to appear. I'm not sure if a deeper knowledge of the filetype/algorithm is needed to understand this ...
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Finding local patterns in a circular list
Consider a list $\boldsymbol{x}=x_0,x_1,\ldots,x_{n-1}$, which we consider to be circular by taking the subscripts modulo $n$. The entries in the list are distinct integers.
A local pattern is a ...
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4
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Number of Salem–Spencer subsets of $\{1,2,3,\dots ,n\}$
I was wondering about sets that do not contain any $3$-term AP, and came to know that the official name of such a set is Salem–Spencer set. I was considering the question of counting the number of ...
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Stricter permutation patterns
(I asked this ten days ago on math.SE, but I received no reply, so I'm trying again here.)
A lot of work has been done on patterns in permutations, where a permutation is said to match a given ...
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On thickness of binary polynomials
OEIS A169945 introduces the concept of thickness of a polynomial as the magnitude of the largest coefficient in the expansion of the square of the polynomial. Considering the $2^{n+1}$ polynomials $p(...
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2
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What is the most appropriate ML technology or math tool for classifying/recognizing 2D scatter plot shapes? [closed]
I would like to be able to automatically classify an input scatter plot into a limited, predefined set of 2-D scatter plots (see attached image), such as a Circle, a Cross, a Straight Line and a Curvy ...
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Graph pattern matching
Given a weighted, oriented, connected graph with $10^7$ vertices and $10^{10}$ edges I need to implement the algorithm for searching various patterns on this graph for less than polynomial time.
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On the cardinality of the set of right-truncatable primes
We say that the (base ten) prime number $p=a_{n}a_{n-1}a_{n-2}\cdots a_{1}a_{0}$ is right-truncatable if all of the following numbers are prime:
\begin{eqnarray*}a_{n},\\a_{n}a_{n-1},\\ a_{n}a_{n-1}...
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Shortest absolute value of path in graph
Suppose we have a weighted, acyclic digraph, with positive and negative edge weights.
Is there an algorithm that determines whether there is a path of weight zero between vertices A and B? The ...
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Expressing Numbers with a Minimal Sum in Powers of 2 [closed]
The first 64 bits of pi are:
11.00100100001111110110101010001000100001011010001100001000110100
Computer multiplication can be sped up by looking for patterns and ...
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Find cycles with specific weights in complete graph
Assume I have an undirected edge-weighted complete graph $G$ of $N$ nodes (every node is connected to every other node, and each edge has an associated weight). Assume that each node has a unique ...
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Can the same dataset be described as Chaotic & Pareto/ Power law distribution?
I'm trying to abstract the mathematical part of the problem as much as possible before the details follow,
There's this dynamic data set that's $O(2^{32})$, a recent result described it as a power-law ...
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