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Analyze audio using Fast Fourier Transform
...you need to calculate the square root of the sum of the square of its real and imaginary components. That is, if your coefficient is a + b*j, then its magnitude is sqrt(a^2 + b^2).
Once you have calculated the magnitude of each FFT coefficient, you need to figure out which audio frequency each FFT ...
The simplest possible JavaScript countdown timer? [closed]
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I have two demos, one with jQuery and one without. Neither use date functions and are about as simple as it gets.
Demo with vanilla JavaScript
function startTimer(duration, display) {
var timer = duration, minutes, seconds;
setInterval(functio...
How do I measure request and response times at once using cURL?
... have a web service that receives data in JSON format, processes the data, and then returns the result to the requester.
14...
How do I create an average from a Ruby array?
...ore, it's not as magical as it might appear. It iterates over each element and then applies an accumulator value to it. The accumulator is then handed to the next element. In this case, our accumulator is simply an integer that reflects the sum of all the previous elements.
Edit: Commenter Dave Ray...
Connect to a locally built Jekyll Server using mobile devices in the LAN
After using jekyll serve on one machine, a WEBrick server is set up and the site can be accessed from localhost:4000 on this particular PC.
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Can the jQuery UI Datepicker be made to disable Saturdays and Sundays (and holidays)?
...be only for the next month. That works fine. I want to exclude Saturdays and Sundays from the available choices. Can this be done? If so, how?
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Checking if a string can be converted to float in Python
I've got some Python code that runs through a list of strings and converts them to integers or floating point numbers if possible. Doing this for integers is pretty easy
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Is there a way to crack the password on an Excel VBA Project?
...pdate some Excel 2003 macros, but the VBA projects are password protected, and it seems there's a lack of documentation... no-one knows the passwords.
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Is there an equivalent of 'which' on the Windows command line?
...ould like to be able to find the full path to a program on the Windows command line, given just its name.
26 Answers
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Float vs Decimal in ActiveRecord
...ation defines floats in binary format. Basically, it stores sign, fraction and exponent to represent a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
That's why there is a Decimal for...