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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How to find the general formula to calculate the slope of a line inside the polygon?

I want to find the general formula to calculate the slope of the bold line in the picture when we put one side of the regular $n$-gon upside. I have found $3$ data below, even though I haven't verified the third data. Note that their sides are…
user516076
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What is the seeming pattern here?

So I can see that to go to the input from step 1 involves a addition of 7, which is the 4th term. But then I can't figure out any link to the 2nd or other steps. Any help would be much appreciated. Thanks.
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The numbers in these patterns go together following the same rule. Find the missing number.

I don't see the pattern of the numbers, can someone tell me what the pattern is?
w38696269
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Visual pattern in IQ test

I recently took an IQ test with 50 questions of visual standard, 42 of which I got right. However, these are the 8 that I was unable to resolve. What do these pictures have in common?
gmn_1450
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Weight bore by a person in human pyramid.

One day I saw human pyramid, then a question came to my mind which is "if there are $k$ rows in a human pyramid can we derive a formula to find the weight bore by any person??" I started like this : Assume that weight of all persons is same, for…
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Number of steps needed to find an arbitrary pattern

For example a pattern could be 1,3,5 and you could say the next number is 7 because you add 2 each time. But what if you are given just the number 1 or 1,3? You can't say that the pattern is you add 2 each time confidently right? Another example are…
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Finding an explicit formula for a sequence

Suppose we have the sequence $$ \left(0, {3\over5}, {4\over5}, {15\over17}, {12\over13},{35\over37},\ldots\right).$$ Is it possible to find an explicit formula $a_n$? I cant seem to find one.
James
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What is the pattern here? Q-function - SOLVED

I've got the following problem: The difinition of the funtion: Q(S,M). The purpose is to find the max number of possibilities how to write the funcition. M is the max number, Smeans the sum of the numbers. To explain how it works, I'd like to show…
2pietjuh2
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Next triplet in the series

What is the next triplet in the below series of triplets: (2,3,4), (47,48,49), (674,675,676), (9407,9408,9409), ___? Few points about the above series: (i) the terms of the triplets are consecutive (ii) there is at least one square among the three…
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Need help with Pattern problem

Letters $A$ to $J$ is a random number. If only $A$ is used. There is just $A$. Which is $1$ scenario If $A$ and $B$ are used. There are $2$ scenarios. $(A=B) (A<>B)$ If$ A, B$ and $C$ are used. There are $5$…
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Can a carrom board striker path be determined

When a carrom board striker is strike to one side of the board(4 sided), it continue hitting all the side. Does the pattern repeat, assuming the striker doesn't slow and stop. I mean, can the point be determined where the striker would strike,…
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How to find a particular number in a triangular arrangement of numbers

I can see the first entry of each row is added to an increase of 1. So 2 = 1+1, 4 = 2+2, 7 = 4+ 3, etc. So I know that the 64th entry is $x_{64} = x_{63}+63$ But I am stuck on how to calculate it. And If I wanted to find the sum of all the…
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Is this pattern solvable?

The objective is to find what the next number is. 0, 1, 1, 0, 2, 0, 0, 0, 0, 1, 1, 0, 2, 0, 0, 0, 0, 1, 1, 2, 2, 0, 0, 0, 0, 1, 0, 2, 2, 0, 0, 0, 0, 1, 0, 2, 1, 0, 2, 0, 0, 0, 0, 2, 1, 0, 2, 0, 0, 0, 0, 2, 1, 0, 2, 0, 0, 0, 0, 1, 1, 0, 2, 0, 0, 0,…
Qmi
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Calculating the Number of Matchsticks Needed to Create Equilateral Triangles

The question is as follows: We know that in order to create 1, 2, 3 and 4 congruent unit equilateral triangles on a flat plane, we need 3, 5, 7 and 9 matchsticks respectively.

What is the minimum number of matchsticks on a flat plane needed to…
geo_freak
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Pattern recognition. Finding the general term

n output 2 1 3 1 4 2 5 3 6 3 7 4 8 5 9 6 10 6 11 7 12 8 13 9 14 10 15 10 16 11 17 12 18…
moe
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