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c===========================================================================
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c This file is part of TISEAN
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c Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
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c TISEAN is free software; you can redistribute it and/or modify
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c it under the terms of the GNU General Public License as published by
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c the Free Software Foundation; either version 2 of the License, or
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c (at your option) any later version.
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c TISEAN is distributed in the hope that it will be useful,
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c but WITHOUT ANY WARRANTY; without even the implied warranty of
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c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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c GNU General Public License for more details.
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c You should have received a copy of the GNU General Public License
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c along with TISEAN; if not, write to the Free Software
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c Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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c===========================================================================
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c store data periodogram of x
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c if iback.ne.0 transform back to get autocorrelation instead
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C author Thomas Schreiber (1998)
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c===========================================================================
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subroutine store_spec(nmax,x,iback)
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dimension x(nmax), w1(nx), w2(nx), iw(15)
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call xstopx ("store_spec: make nx larger.")
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call rffti1(nmax,w2,iw)
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call rfftf1(nmax,x,w1,w2,iw)
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10 x(n)=x(n)/real(nmax)
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amp=x(2*n-2)**2+x(2*n-1)**2
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pha=atan2(x(2*n-1),x(2*n-2))
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if(mod(nmax,2).eq.0) x(nmax)=x(nmax)**2
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call rfftb1(nmax,x,w1,w2,iw)