Fast Walsh–Hadamard transform

（重定向自Fast Hadamard transform）

Example for the input vector (1,0,1,0,0,1,1,0)

In computational mathematics, the Hadamard ordered fast Walsh–Hadamard transform (FWHT_h) is an efficient algorithm to compute the Walsh–Hadamard transform (WHT). A naive implementation of the WHT would have a computational complexity of O( $N^2$ ). The FWHT_h requires only $N \log N$ additions or subtractions.

单词	Fast Hadamard transform
释义	Fast Hadamard transform 英语百科 Fast Walsh–Hadamard transform （重定向自Fast Hadamard transform） In computational mathematics, the Hadamard ordered fast Walsh–Hadamard transform (FWHT_h) is an efficient algorithm to compute the Walsh–Hadamard transform (WHT). A naive implementation of the WHT would have a computational complexity of O( $N^2$ ). The FWHT_h requires only $N \log N$ additions or subtractions.
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