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If one draws the data-flow diagram for this pair of operations, the (x 0, x 1) to (y 0, y 1) lines cross and resemble the wings of a butterfly, hence the name (see also the illustration at right). A decimation-in-time radix-2 FFT breaks a length-N DFT into two length-N/2 DFTs followed by a combining stage consisting of many butterfly operations.
English: Butterfly life cycle diagram, in English. The butterfly is the Southern Monarch (Danaus erippus). Date: 1 August 2020: Source:
Possibly the original butter-fly. [6] A male brimstone (Gonepteryx rhamni) in flight.The Oxford English Dictionary derives the word straightforwardly from Old English butorflēoge, butter-fly; similar names in Old Dutch and Old High German show that the name is ancient, but modern Dutch and German use different words (vlinder and Schmetterling) and the common name often varies substantially ...
The scales on butterfly wings are pigmented with melanins that can produce the colours black and brown. The white colour in the butterfly family Pieridae is a derivative of uric acid, an excretory product. [13] [40]: 84 Bright blues, greens, reds, and iridescence are usually created not by pigments but through the microstructure of the scales.
The name "butterfly" is believed to have originated from a member of this family, the brimstone, Gonepteryx rhamni, which was called the "butter-coloured fly" by early British naturalists. [ 2 ] The sexes usually differ, often in the pattern or number of the black markings.
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The butterfly at the edge of and in leaved woods, in the early morning found drinking on dewy roads in the woods and at puddles; it becomes more restless at a later hour, flying at a considerable height, is fond of foul-smelling matter (excrements, dung, urine, cheese) and is easily baited with them. The flight is strong and graceful.
Papilio machaon, the Old World swallowtail, is a butterfly of the family Papilionidae.The butterfly is also known as the common yellow swallowtail or simply the swallowtail (a common name applied to all members of the family, but this species was the first to be given the name).