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Fix the floating-point exception caused by a c2r FFT when not enough space allocated for data array.

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This commit is contained in:
Joe Taylor 2021-04-12 15:21:38 -04:00
parent 47332aa9ac
commit 3f98270681
2 changed files with 8 additions and 7 deletions
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4
map65/libm65/four2a.f90
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@ -19,9 +19,10 @@ subroutine four2a(a,nfft,ndim,isign,iform)
! This version of four2a makes calls to the FFTW library to do the
! actual computations.
use fftw3
parameter (NPMAX=2100) !Max numberf of stored plans
parameter (NSMALL=16384) !Max size of "small" FFTs
complex a(nfft) !Array to be transformed
complex a(nfft+1) !Array to be transformed
complex aa(NSMALL) !Local copy of "small" a()
integer nn(NPMAX),ns(NPMAX),nf(NPMAX) !Params of stored plans
integer*8 nl(NPMAX),nloc !More params of plans
@ -29,7 +30,6 @@ subroutine four2a(a,nfft,ndim,isign,iform)
logical found_plan
data nplan/0/ !Number of stored plans
common/patience/npatience,nthreads !Patience and threads for FFTW plans
include 'fftw3.f90' !FFTW definitions
save plan,nplan,nn,ns,nf,nl
if(nfft.lt.0) go to 999

11
map65/libm65/q65b.f90
View File

@ -8,7 +8,7 @@ subroutine q65b(nutc,nqd,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
type(hdr) h !Header for the .wav file
integer*2 iwave(60*12000)
complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2-1)
complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
logical xpol,first
real*8 fcenter
character*12 mycall0,hiscall0
@ -87,10 +87,11 @@ subroutine q65b(nutc,nqd,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
npol=1
if(xpol) npol=4
do ipol=1,npol
if(ipol.eq.1) cz=cx
if(ipol.eq.2) cz=0.707*(cx+cy)
if(ipol.eq.3) cz=cy
if(ipol.eq.4) cz=0.707*(cx-cy)
if(ipol.eq.1) cz(0:MAXFFT2-1)=cx
if(ipol.eq.2) cz(0:MAXFFT2-1)=0.707*(cx+cy)
if(ipol.eq.3) cz(0:MAXFFT2-1)=cy
if(ipol.eq.4) cz(0:MAXFFT2-1)=0.707*(cx-cy)
cz(MAXFFT2)=0.
call four2a(cz,2*nfft2,1,1,-1) !Transform to time domain (real), fsample=12000 Hz
do i=0,nfft2-1
j=nfft2-1-i