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| FFTC1D changes variables Delphi http://forum.alglib.net/viewtopic.php?f=2&t=3805 |
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| Author: | janpdk [ Tue May 23, 2017 2:42 pm ] | ||
| Post subject: | FFTC1D changes variables Delphi | ||
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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| Author: | Sergey.Bochkanov [ Wed May 24, 2017 4:49 pm ] |
| Post subject: | Re: FFTC1D changes variables Delphi |
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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| Author: | janpdk [ Thu May 25, 2017 7:35 am ] |
| Post subject: | Re: FFTC1D changes variables Delphi |
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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