# Tagged Questions

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### Get a representative vector from a large set, and compare it with samples.

We're a small team of programmers and we're triying to solve a little problem, but we think we need some advices from professional mathematicians. We want to know if a picture of a card is an ...
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### Data Manipulation and Compression

I have this data: ...
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### Partitioning a sequence of numbers based on a percentage

I have a sequence $s$ of rational numbers where $|s|=n$. I am given a percentage $p$ to partition the sequence $s$ into $\frac{1}{p}$ parts, such that each part contains $p\%$ number of elements of ...
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### Basic arithmetic question

I have to find 80%, 60%, 40%, 20% and it's values of a range of scores. For one range, my values go from 2 to 8 (mean will be 5 which means, 50% of that range's value = 5) For second range, my ...
If I have two frequencies: $f_1 = 20\text{ Hz}$ $f_2 = 40\text{ Hz}$ the mean between them should be $$f_\text{mean} =\frac{20+40}{2}=30\text{ Hz}$$ How come that if I calculate their periods' ...