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 Post subject: FFTC1D changes variables Delphi
PostPosted: Tue May 23, 2017 2:42 pm 
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Joined: Tue May 23, 2017 2:30 pm
Posts: 2
I am using procedure FFTC1D in Delphi 7.0.
The problem I have is the following:
this procedure changes variables not being the outputvariable of the procedure.

So executing FFT.FFTC1D(W,N); changes variable Inp!

Extra:
I am not using explicit pointers nor directive Absolute.

Note:
I have seen the procedure FFTC1D is using a lot of Move-functions and I think one of them is done incorrect?!

Please Help.


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FF1CD.txt [2.04 KiB]
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 Post subject: Re: FFTC1D changes variables Delphi
PostPosted: Wed May 24, 2017 4:49 pm 
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Joined: Fri May 07, 2010 7:06 am
Posts: 775
FFTC1D performs inplace conversion of input array. Look, it has no other way of telling about its results except for replacing W.

As for Inp variable - you did not performed true copying of Inp to W, you just copied references. So, W and Inp point to same array.


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 Post subject: Re: FFTC1D changes variables Delphi
PostPosted: Thu May 25, 2017 7:35 am 
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Joined: Tue May 23, 2017 2:30 pm
Posts: 2
Thank you Sergey, I dit not realize that TComplex1DArray is a pointer.
After reprogramming the module with FFTC1D it is working fine now.

Problem solved.


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