[心得] Fourier

看板NTUEE111HW作者herbert570 (エニシ縁)時間18年前 (2007/12/14 01:53)推噓8(8推 0噓 8→)

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一個函數的 Fourier 轉換(如果可行的話) 是在找該函數用cos和sin表示時的係數。 Fourier transform ft of A gives the coefficients of the cos(kx) and sin(kx) of the Fourier series that is used to express A. ^^^^^^^^^^^^^^ If the Fourier series is 1.uncountable infinite : A is non-period ft 2. countable infinite : A is period ft Note that an uncountable infinite series behaves as a function (when taking summation of the series). The "unit" element of Fourier transforming is like the unit matrix. A function can always be regard as a vector. 我想這個可能是矩陣量子力學和薜丁格方程式的關聯。轉錄自我的個板TFA (置入性行銷？XD) -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.240.113

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