Questions tagged [pattern-recognition]

  1. From a samples of a small samples of mathematical objects, conjecture a common pattern to all of them. This includes "guess the next terms in the sequence" question (consider checking OEIS first). Please provide as much context as possible.

  2. Mathematical ideas related to pattern recognition, subfields of AI and statistics. Please check first if StackOverflow, Computer Science Stack Exchange, or Cross Validated is more appropriate.

Generally the term "pattern recognition" would refer to one of the two following type of question:

  • The question involve seeing a samples of a small number of mathematical objects, and attempt to figure out what are the rest of the objects are, and what properties would they have, and the properties of the class of objects as a whole.

One frequently seen type of question in this category is "guess the next number in sequence." If there is no explicit mathematical context given, such a question will, typically, be rapidly closed. For such a question that does have an explicit mathematical context, the first few terms of a sequence of numbers is given, and the answer would need to explain the pattern (for example, a recurrence formulas) that describes the sequence, and the next term or the next few terms in the sequence. If your question is of this type, consider checking OEIS (On-Line Encyclopedia of Integer Sequences) first to see if your sequences have appeared before.

Other types in this category exist too. For example, a formula might be given that produce a group based on some parameters. After plugging in some small values, one get certain groups, and trying to find a common properties among all those small sample might hint at a theorem about all groups given by that formulas.

Note that by nature, questions in this category do not have any standard for correct answer, as the answer is required to extrapolate a small samples to a general pattern. This is frequently the case with "guess the next terms in the sequence" question as usually seen in school. However, many questions do have such a standard, as long as it is put in a suitable context. Before posting the question, consider adding as much context as possible.

Questions in this category might not have a single answer, as it is not unusual for there to be many correct patterns (perhaps they are logically equivalence, or perhaps there are other reasons).

  • The question is about mathematical ideas related to the fields referred to as "pattern recognition", subfields of artificial intelligence as well as statistics.

The various subfields grouped under the term "pattern recognition" concerns with the task of making computer recognize patterns from a large amount of data. Given a large sets of data, the computer is expected to be able to classify them, figure out relationships between variables, extrapolate or interpolate to new data points, figure out global properties to the set of data, etc. A specific subfield, computer vision, is where the term came from, so "pattern recognition" might refer to just that subfield. Before posting a question of this category, consider whether it would be more appropriate to post in StackOverflow, Computer Science Stack Exchange, or Cross Validated.

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Homework problem for a first grader on $9$gag

I saw the below image on 9gag. And naturally I asked myself how many patterns can one find (and justify)? Are there any "fun" patterns, using your "first grader imagination" and your mathematical skills?
Olba12
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What is the pattern or relation in this table?

Here is the table: $$\begin{array}{c} 0\\ 1\\ 1& 1\\ 3& 2& 3\\ 5& 3& 3& 5\\ 11 &8 &10 &8 &11\\ 21 &13 &14 &14 &13 &21\\ 43 &30 &37 &36 &37 &30 &43\\ 85 &55 &61 &55 &55 &61 &55 &85\\ 171 &116 &140 &140 &146 &140 &140 &116 &171 …
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Find the pattern, What is the correct answer

Ok, so this question is from seriously hard IQ test that has been doing the rounds on facebook, ok, 17 questions are easy 3 are hellishly hard, The answer to this one is 17, I do not know why, I found out by trial and error just to test, but It's…
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Why does Pascal's triangle follow a pattern using derivatives?

I was learning the derivatives and I remembered Pascal's triangle and I discover that I can write it with derivatives without having to draw it. Let's see Pascal's triangle: Any row can be written using derivatives, per example the $6th$ row. The…
ESCM
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A pattern involving '8' and square roots

If we take the square root of 012345, we get 111.108055514. The square root of 012345678901234567 approximates to 111111110.611. We're taking the square roots of numbers following a pattern, the numbers 0-9 repeating with an even number of digits…
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Pattern Recognition Puzzle - What would 100 correspond to?

There is a mathematical puzzle I saw this morning that I am having trouble with. Seemed easy initially but couldn't crack the code. Can anybody please help work out the answer for the below? Given the following pattern, find out 1) What is the…
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Trying to figure out a pattern's formula for a game.

Some basic information is that the game starts with 6 inventory slots and the first additional slot (7th slot) costs 400 coins, the 8th slot costs 857, the 9th 1339, and so on. The game is called Sol's RNG (Link Here). I am trying to figure out if…
xiao xiao
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Why Does This Summation Pattern Occur?

This is probably something stupid and for some reason I can't see it, but let's say you are taking the sum of the first $10^{i}$ squares. If $i=1$ we get $385$,$i=2$ we get $338350$, $i=3$ we get $333833500$ ... the obvious pattern for the digits is…
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Finding pattern- $6$ $11$ $25$

Finding pattern$$ \begin{matrix} 6 & 11 & (25) \\ 8 & 6 & (16) \\ 12 & 5 & (?) \\ \end{matrix} $$ Options are : $10/12/14/16$ My attempt: $11-6=5, 5^2=25$. But it's not valid for next. $6^2-11=25$, but not…
aarbee
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Function for number patterns

I'm primarily a programmer and am pretty rusty at math... so forgive me if this is a stupid question. I have four number patterns as follows: a) 3, 13, 31 b) 5, 17, 37 c) 7, 21, 43 d) 9, 25, 49 What are the functions to get any number (n) for…
nzifnab
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Pattern of (1201, 2121, 3142, 4253, 5342)

What could be a part of the following set of numbers: $1201, 2121, 3142, 4253, 5342$ $a) 1317$ $b) 2315$ $c) 2573$ $d) 3456$ Differences between the numbers are $920, 1021, 1111, 1089.$ It's not making sense. Increasing then decresing. So…
aarbee
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Number pattern problem

I need some help to figure out the following number pattern: Find the next number in the following sequence: $3, 2, 3, 12, 35, 78$. I tired to figure out the difference by add/subtract/multiple/division also tried to find the existing known…
Karen
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How to calculate smallest pattern size based on set of ratios

So I have x number of items, each one has its own appearance ratio for making a pattern, of which I'm trying to determine the smallest possible pattern. The appearance ratios for all items total up to 1. This is a bit of a complicated question to…
Essential
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Mathematical formula for a pattern

I was cooking and saw a chart of temperature vs cooking time like so: $154\mathrm{F}$ - $36$ hours $164\mathrm{F}$ - $18$ hours $174\mathrm{F}$ - $9$ hours Basically for every $10\mathrm{F}$ increase in temperature, cooking time is halved. Now I'm…
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What number comes next in the sequence $7, 16, 8, 27, 9,...$?

What number comes next in this series? $$7, 16, 8, 27, 9,...$$ I thought it was $38$, but I'm wrong. It is a multiple choice, and options are $27, 10, 40, 37$. Don't worry - I'm not cheating on anything, but helping my daughter with…
KTA
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