Show HN: Resonate – real-time high temporal resolution spectral analysis

Re:Show HN: Resonate – real-time high temporal resolution sp... by james_a_craig on Tuesday April 15, 2025 @11:51AM (#43694599)

For some reason the value of Pi given in the C++ code is wrong!

It's given in the source as 3.14159274101257324219 when the right value to the same number of digits is 3.14159265358979323846. Very weird. I noticed when I went to look at the C++ to see how this algorithm was actually implemented.

https://github.com/alexandrefrancois/noFFT/blob/main/src/Res... line 31.

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Re:Show HN: Resonate – real-time high temporal resolution sp... by 2YwaZHXV on Tuesday April 15, 2025 @12:12PM (#43694938)

[delayed]

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Re:Show HN: Resonate – real-time high temporal resolution sp... by james_a_craig on Tuesday April 15, 2025 @12:27PM (#43695146)

Yeah, it’s as if they wrote a program to calculate pi in a float and saved the output. Very strange choice given how many places the value of pi can be found.

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Re:Show HN: Resonate – real-time high temporal resolution sp... by arjf on Tuesday April 15, 2025 @12:32PM (#43695219)

Indeed... I honestly don't remember where or how I sourced the value, and why I did not use the "correct" one - I will correct in the next release of the package. Thanks for pointing it out!

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Re:Show HN: Resonate – real-time high temporal resolution sp... by pvg on Tuesday April 15, 2025 @01:48PM (#43696167)

You got off easy compared to this dude https://en.wikipedia.org/wiki/William_Shanks

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Re:Show HN: Resonate – real-time high temporal resolution sp... by arjf on Wednesday April 16, 2025 @05:19PM (#43710509)

At least I might have introduced a bit of creative noise in some AI coding models :-P

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Re:Show HN: Resonate – real-time high temporal resolution sp... by teuobk on Tuesday April 15, 2025 @12:12PM (#43694937)

That's as close as you can get to pi with a single-precision float.

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Re:Show HN: Resonate – real-time high temporal resolution sp... by pvg on Tuesday April 15, 2025 @12:07PM (#43694858)

That is a very 'childhood exposure to 8 digit calculators' thing to notice.

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Re:Show HN: Resonate – real-time high temporal resolution sp... by james_a_craig on Tuesday April 15, 2025 @12:24PM (#43695113)

Childhood exposure to pi generation algorithms; the correct version above was from memory.

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Re:Show HN: Resonate – real-time high temporal resolution sp... by pvg on Tuesday April 15, 2025 @12:38PM (#43695290)

Close enough! The wrong 7 jumped out at me instantly although I didn't remember more than a few after.

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