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What Is the Fourier Transform?

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474 points rbanffy | 3 comments | 04 Sep 25 22:11 UTC | HN request time: 0.002s | source
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anyfoo ◴[04 Sep 25 23:48 UTC] No.45133536[source]▶
If you like Fourier, you're going to love Laplace (or its discrete counterpart, the z transform).

This took me down a very fascinating and intricate rabbit hole years ago, and is still one of my favorite hobbies. Application of Fourier, Laplace, and z transforms is (famously) useful in an incredibly wide variety of fields. I mostly use it for signal processing and analog electronics.

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armanj ◴[05 Sep 25 02:36 UTC] No.45134494[source]▶
Years ago, I often struggled to choose between Amazon products with high ratings from a few reviews and those with slightly lower ratings but a large volume of reviews. I used the Laplace Rule of Succession to code a browser extension to calculate Laplacian scores for products, helping to make better decisions by balancing high ratings with low review counts. https://greasyfork.org/en/scripts/443773-amazon-ranking-lapl...
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1. Shadowmist ◴[05 Sep 25 11:35 UTC] No.45137382[source]▶
I always assume that all the ratings are fake when there is a low count of ratings since it is easy for the seller to place a bunch of game orders when they are starting out.
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2. anentropic ◴[05 Sep 25 17:45 UTC] No.45141378[source]▶
A bigger problem I find is many Amazon listings having a large number of genuine positive reviews, but for a completely different product than the one currently for sale.

Recently I was buying a chromecast dongle thing and one of the listings had some kind of "Amazon recommends" badge on it, from the platform. It had hundreds of 5 start reviews, but if you read them they were all for a jar of guava jam from Mexico.

I'm baffled why Amazon permits and even seemingly endorses this kind of rating farming

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3. ◴[05 Sep 25 18:36 UTC] No.45142024[source]▶