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Hi I am currently studying FHT Algorithm but have a hard time to grasp it.

I want to calculate FHT when N=8.

http://mathworld.wolfram.com/HartleyTransform.html

thanks to (19) of the upper link, the FFT can be written as below

enter image description here

as T and H have inverse matrix, using associative law is allowed

enter image description here

then for N=8,

enter image description here

I have used the final expression to my wave example, but did not gain proper result.

that indicates there must be something wrong.

but don`t know where is the error.

anyone knows what is the wrong in above?

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