How to delete "ghost"-channels?

Question

Hi all,
I have the following problem: After performing an FFT, Diadem (9.1) creates me several ghost channels: These channels are empty, have no name and their number is not equal to their index.
Now first of all: Why do does channels appear?
Or: How can I delete them? I tried the following:
for i=GlobUsedChn to 1 step -1
   if chnname(i)="" then
      chndelete(i)
   end if
next
But because the number and index are not equal that delets only some of them.
Regards
Patrick
PS: sorry for my edit-war
Message Edited by flupa on 03-28-2008 01:27 PM

Answer 1

Hi Johannes,
I perform it in script. I wrote that script weeks ago and it worked fine. But now those ghost channels happen to appear.
Here is the code snipped after which the ghost channels appear:
' 4. step: calculate FFT
FFTINTERVUSER ="LengthStartOverl"
FFTINTERVPARA(1) =16
FFTINTERVPARA(2) =intervalLength
FFTINTERVPARA(3) =1
FFTINTERVOVERL =0 ' Overlap in %
FFTWNDFCT ="Hanning"
FFTWNDPARA =10
FFTWNDCHN ="time"
FFTWNDCORRECTTYP ="periodic"
FFTAVERAGETYPE ="No"
FFTAMPLFIRST ="Amplitude"
FFTAMPL =1
FFTAMPLTYPE ="Ampl.Peak"
FFTCALC =0
FFTAMPLEXT ="No"
FFTPHASE =0
FFTCEPSTRUM =0
Call CHNFFT1("time",P)
' 5. step: transfer function
FFTINTERVUSER ="LengthStartOverl"
FFTINTERVPARA(1) =16
FFTINTERVPARA(2) =intervalLength
FFTINTERVPARA(3) =1
FFTINTERVOVERL =0
FFTWNDFCT ="Hanning"
FFTWNDPARA =10
FFTWNDCHN ="time"
FFTWNDCORRECTTYP ="periodic"
FFTAVERAGETYPE ="No"
FFTAMPLFIRST ="Amplitude"
FFTAMPL =0
FFTAMPLTYPE ="Ampl.Peak"
FFTCROSSSPECTR =0
FFTCOHERENCE =0
FFTTRANSFCTTYPE ="Spectrum H1"
FFTCROSSPHASE =0
FFTTRANSPHASE =1
Call CHNFFT2("time",keyphasorChn,P)
call msgboxdisp("Index = " & ChnIndex(GlobUsedChn))
call msgboxdisp("GlobUsedChn = " & GlobUsedChn)
HTH, Thanks
Patrick