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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What is the next picture in this sequence?

I was reading a book on logical reasoning and came across the following: Can anyone give me the answer to the question. We want the next sequence ?
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Find pattern of function with 2 inputs

Given: $1*2=7$ $2*(-4)=2$ $(-7)*3=12$ Find: $[(-3) * 1]*(-5)$ There must be some function $f(a,b)$ related to $a*b$ but i couldn't find that out.
Aung
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Triangular pyramid. Find the sum of certain numbers on pyramid.

Given that the set of natural numbers continue in the triangular pattern shown below, find the sum of the 6th number in row 7 and the 9th number in row 10. Note: Row 1 is the first row of the…
Ian L
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Is there any pattern in this two-dimensional array?

1 2 3 4 5 6 7 8 9 1 3 2 5 3 7 4 9 5 1 4 5 2 7 8 3 10 11 1 5 6 7 2 9 10 11 3 1 6 7 8 9 2 11 12 13 1 7 8 9 10 11 2 13 14 1 8 9 10 11 12 13 2 15
walter
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how to find formula that matches pattern

I have a pattern that I'm struggling to find the formula for. For inputs of 0 - 3, the expected result is 0. For inputs 4 - 6, the expected result is 3. 7 - 9 should output 6. 10 - 12 should output 9. 13 - 15 should output 12. 16 - 18 should output…
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Help figuring out a simple formula?

I have an alpha value with a range of 0.0 - 1.0 as well as a value N. If the alpha value is 0.5, I want to make no change to N. If the alpha value is 0, I want to double N. If the alpha value is 1.0 I want to halve N. I want a clean formula to…
Vadoff
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Can't figure it out, why is this answer is right. By what pattern

I found this example in some old book and can't figure it out, why is this answer is right. Would like to get an explanation to it. Thanks in advance. I don't have reputation over 10, so I uploaded image to some other host, hope it won't be a…
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Generate equation from pattern

What equation describes the growth pattern of this sequence: P = 5,25,35,55,65,85,95... Heres the diferences: 5 (20) 25 (10) 35 (20) 55 (10) 65 ... I have tried the P = Ax + B but it doesn work since the slope varies from 20 to 10. Thanks!!
poker3
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Pattern Finding in terms of previous terms

Find the next terms of the pattern: $$ 1,4,24,192,2120,31140,566202 \dots$$ Tell the pattern expression. I have already tried Lagrange interpolation. But it is not accurate enough.
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Pattern finding of last few digit of a^b

The question is:Find the last two digits of 9^2013.(No calculators allowed to solve this question.) Options: (A)01 (B)29 (C)41 (D)81 (E)89 From this point,I will show my working, 9^2=81(Last Digit 1) 9^3=1x9=9 (Now only focusing on ONLY last…
ministic2001
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What is the code for this sentence?

there. I came across an encryption problem, as described in the picture. In tought real hard about it but to no avail. There might be a rule governing this kind of encryption. I wonder how we can solve problems like this one. Is there any general…
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What is the probability that the product of the integers from n-2 to n+2 are also a product of 10 if n∈{13,14,15,16,17}?

What is the probability that the product of the integers from n-2 to n+2 are also a product of 10 if n∈{13,14,15,16,17}? For Example If n was 13 then the product would be 11*12*13*14*15 I want an answer that does not use brute force.
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What is the pattern in this set of numbers?

$[3,6,11,18,27,38,...]$. I need to write this set in set-builder notation but I can't find any pattern, I see no common multiple, it doesn't appear to be a geometric or arithmetic series. The problem comes from the book of proof.
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Select the option for “?” that continues the pattern in each question.

i'm no to sure where to start with these pattern. If they were in an ordinary descending or ascending order it'd be easier. There's a pattern here, What would be the next number after 20? Can anyone assist please 3, -6, 12, 4, 20, ?
Jane
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I found a strange number pattern in Base 10. Does anyone know what it means?

I was trying to think of a good equation for texture smoothing to be used in programming. I came up with this. With texture smoothing however it must be based on division. $01$ to $10$ = $9$ or $3^2$ $02$ to $20$ = $18$ or $2\times 3^2$ $03$ to $30$…