In the context of fast Fourier transform algorithms, a butterfly is a portion of the computation that combines the results of smaller discrete Fourier transforms (DFTs) into a larger DFT, or vice versa (breaking a larger DFT up into subtransforms). The name "butterfly" comes from the shape of the data-flow diagram in the radix-2 case, as described below. The earliest occurrence in print of the term is thought to be in a 1969 MIT technical report. The same structure can also be found in the Viterbi algorithm, used for finding the most likely sequence of hidden states. Most commonly, the term "butterfly" appears in the context of the Cooley–Tukey FFT algorithm, which recursively breaks down a DFT of composite size n = rm into r smaller transforms of size m where r is the "radix" of the transform. These smaller DFTs are then combined via size-r butterflies, which themselves are DFTs of size r (performed m times on corresponding outputs of the sub-transforms) pre-multiplied by roots of unity (known as twiddle factors). (This is the "decimation in time" case; one can also perform the steps in reverse, known as "decimation in frequency", where the butterflies come first and are post-multiplied by twiddle factors. See also the Cooley–Tukey FFT article.) (Wikipedia).
Two butterflies playing with each other? mating?
What are these butterflies doing? Comment below! Filmed with iPhone 6s+
From playlist Interesting videos
#Mandala MANDALA LOVERS ALERT- Mandala (Sanskrit: मण्डल, lit, circle) is a spiritual and ritual symbol in Indian religions, representing the universe-check out more videos about mandala below-. * check out my Blog Post for details on Mandala supplies- https://www.theartgeekblog.com/post/mu
From playlist Bag
Butterflies Wooden Toy 3D Model
Based on a Youtube video (https://www.youtube.com/watch?v=EWrZvaLvPLk) published 8 years ago. Modeled with Solidworks 2016. Rendered with Simlab Composer 7 Mechanical Edition. Free 3D model at https://skfb.ly/6Zo78.
From playlist Wooden Toys
Butterfly Animation (Desmos GC)
Taking advantage of the fact that Desmos allows users to write the corners of an inputted image in terms of existing parameters (sliders). Link: https://www.desmos.com/calculator/bav0udgsme
From playlist Desmos Activities, Illustrations, and How-To's
What is a Butterfly Spread? - Options Trading Strategies Explained These classes are all based on the book Trading and Pricing Financial Derivatives, available on Amazon at this link. https://amzn.to/2WIoAL0 Check out our website http://www.onfinance.org/ Follow Patrick on twitter here:
From playlist Class 2: An Introduction to Options
We’ve got a NEW Deep Look episode about monarch butterflies! Watch here 👉 https://youtu.be/3DC8INr7tvQ #shorts #monarchbutterfly #deeplook #insects #behindthescenes #timelapse
From playlist Butterflies & Caterpillars: Delicate But Mighty
How Do Neural Networks Grow Smarter? - with Robin Hiesinger
Neurobiologists and computer scientists are trying to discover how neural networks become a brain. Will nature give us the answer, or is it all up to an artificial intelligence to work it out? Watch the Q&A: https://youtu.be/DoTSICEUm90 Get Robin's Book: https://geni.us/5wIuX0W Join Peter
From playlist Livestreams
Black Holes and the Butterfly Effect - Douglas Stanford
Friends Lunch with a Member - Douglas Standford https://www.ias.edu/events/friends-lunch-stanford More videos on http://video.ias.edu
From playlist Friends of the Institute
What is a Fast Fourier Transform (FFT)? The Cooley-Tukey Algorithm
Fourier Transform video: https://www.youtube.com/watch?v=ykNtIbtCR-8 Algorithm Archive Chapter: https://www.algorithm-archive.org/chapters/FFT/cooley_tukey.html If you want to contribute, here's the github repo: https://github.com/algorithm-archivists/algorithm-archive This video took f
From playlist Algorithm Archive
Dynamical Constraints on RG Flows and Cosmology - Tom Hartman
Monday, October 28, 2019 High Energy Theory Seminar “Dynamical Constraints on RG Flows and Cosmology” I will discuss time-dependent probes of the renormalization group, and derive new constraints that govern the spread of local operators in holographic theories. The same methods lead to s
From playlist IAS High Energy Theory Seminar
Calendar and butterfly spread option trades (FRM T3-40)
[my xls is here https://trtl.bz/2Piz0O3] The calendar spread is a neutral strategy: it profits if the stock remains range-bound. To create a calendar spread with calls, we write a call with a certain strike price (in my example, K = 20) and buy a call with the same exercise price but a LON
From playlist Financial Markets and Products: Option Trading Strategies (FRM Topic 3, Hull Ch 10-12)
Some Butterflies Are Secretly Cannibals
In the insect world, there are few creatures as gentle and innocent as a butterfly. And yet, some butterflies have… an unexpected side to them. SciShow is supported by Brilliant.org. Go to https://Brilliant.org/SciShow to get 20% off of an annual Premium subscription. Hosted by: Hank Gr
From playlist Biology
The Absolute Worst Thing About Butterflies
Visit http://brilliant.org/scishow/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription. Who doesn’t love to gaze at a beautiful butterfly fluttering by? Aesthetically speaking, they are simply wonderful to watch. Wonderful, t
From playlist Biology
How two butterflies became one
Here's why you shouldn't judge a butterfly species by its wing coloration. SUPPORT MINUTEEARTH ************************** If you like what we do, you can help us!: - Become our patron: https://patreon.com/MinuteEarth - Share this video with your friends and family - Leave us a comment (w
From playlist Evolution
M6 - Butterfly Cluster - Deep Sky Videos
Messier 6 - The Butterfly Cluster. Messier object playlist: http://bit.ly/MessierObjects Discussed by Professor Mike Merrifield from the University of Nottingham. Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/#!/DeepSkyVideos Facebook: http://www.face
From playlist Messier Objects