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four2.f
6
four2.f
@ -36,7 +36,7 @@ C the naive NTOT**2. Furthermore, less error is built up.
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C Written by Norman Brenner of MIT Lincoln Laboratory, January 1969.
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C See IEEE Audio Transactions (June 1967), Special issue on FFT.
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DIMENSION DATA(1), N(1)
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DIMENSION DATA(1048576), N(1)
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NTOT=1
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DO 10 IDIM=1,NDIM
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10 NTOT=NTOT*N(IDIM)
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@ -78,7 +78,7 @@ C EXCHANGE DATA(J1,J4REV,J5) WITH DATA(J1,J4,J5) FOR ALL J1 FROM 1
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C TO NPREV, ALL J4 FROM 1 TO N (WHICH MUST BE A POWER OF TWO), AND
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C ALL J5 FROM 1 TO NREM. J4REV-1 IS THE BIT REVERSAL OF J4-1. E.G.
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C SUPPOSE N = 32. THEN FOR J4-1 = 10011, J4REV-1 = 11001, ETC.
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DIMENSION DATA(1)
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DIMENSION DATA(1048576)
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IP0=2
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IP1=IP0*NPREV
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IP4=IP1*N
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@ -135,7 +135,7 @@ C IT IS NOT NECESSARY TO REWRITE THIS SUBROUTINE INTO COMPLEX
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C NOTATION SO LONG AS THE FORTRAN COMPILER USED STORES REAL AND
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C IMAGINARY PARTS IN ADJACENT STORAGE LOCATIONS. IT MUST ALSO
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C STORE ARRAYS WITH THE FIRST SUBSCRIPT INCREASING FASTEST.
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DIMENSION DATA(1)
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DIMENSION DATA(1048576)
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real*8 twopi,wstpr,wstpi,wr,wi,w2r,w2i,w3r,w3i,wtempr
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@ -6,6 +6,8 @@ subroutine pix2d(d2,jz,mousebutton,s2,nchan,nz,b)
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integer*2 d2(jz) !Raw input data
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real s2(nchan,nz) !2-d spectrum
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integer*2 b(60000) !Pixels corresponding to 2-d spectrum
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data nx0/0/
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save
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tbest=s2(2,1)
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s2(1,1)=s2(3,1)
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