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/ IRIX Base Documentation 2001 May / SGI IRIX Base Documentation 2001 May.iso / usr / share / catman / p_man / cat3 / complib / sdfft1du.z / sdfft1du
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Text File  |  1998-10-30  |  5.2 KB  |  133 lines
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  4. ssssfffffffftttt1111dddduuuu,,,,ddddfffffffftttt1111dddduuuu((((3333FFFF))))                                        ssssfffffffftttt1111dddduuuu,,,,ddddfffffffftttt1111dddduuuu((((3333FFFF))))
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  8. NNNNAAAAMMMMEEEE
  9.      ddddfffffffftttt1111dddduuuu,,,, ssssfffffffftttt1111dddduuuu ---- 1D Real to Complex Fast Fourier Transform.
  10.  
  11. FFFFOOOORRRRTTTTRRRRAAAANNNN SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
  12.      ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee DDDDFFFFFFFFTTTT1111DDDDUUUU(((( jjjjoooobbbb,,,, nnnn,,,, sssseeeeqqqquuuueeeennnncccceeee,,,, iiiinnnncccc,,,, wwwwoooorrrrkkkkssssppppaaaacccceeee ))))
  13.      iiiinnnntttteeeeggggeeeerrrr            jjjjoooobbbb,,,, nnnn,,,, iiiinnnncccc
  14.      ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn   sssseeeeqqqquuuueeeennnncccceeee((((****)))),,,, wwwwoooorrrrkkkkssssppppaaaacccceeee((((****))))
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  16.      ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee SSSSFFFFFFFFTTTT1111DDDDUUUU(((( jjjjoooobbbb,,,, nnnn,,,, sssseeeeqqqquuuueeeennnncccceeee,,,, iiiinnnncccc,,,, wwwwoooorrrrkkkkssssppppaaaacccceeee ))))
  17.      iiiinnnntttteeeeggggeeeerrrr            jjjjoooobbbb,,,, nnnn,,,, iiiinnnncccc
  18.      rrrreeeeaaaallll               sssseeeeqqqquuuueeeennnncccceeee((((****)))),,,, wwwwoooorrrrkkkkssssppppaaaacccceeee((((****))))
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  21. CCCC SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
  22.      iiiinnnntttt ssssfffffffftttt1111dddduuuu (((( iiiinnnntttt jjjjoooobbbb,,,, iiiinnnntttt nnnn,,,, ffffllllooooaaaatttt ****sssseeeeqqqquuuueeeennnncccceeee,,,,
  23.                   iiiinnnntttt iiiinnnncccc,,,, ffffllllooooaaaatttt ****wwwwoooorrrrkkkkssssppppaaaacccceeee))));;;;
  24.  
  25.      iiiinnnntttt ddddfffffffftttt1111dddduuuu (((( iiiinnnntttt jjjjoooobbbb,,,, iiiinnnntttt nnnn,,,, ddddoooouuuubbbblllleeee ****sssseeeeqqqquuuueeeennnncccceeee,,,,
  26.                   iiiinnnntttt iiiinnnncccc,,,, ddddoooouuuubbbblllleeee ****wwwwoooorrrrkkkkssssppppaaaacccceeee))));;;;
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  30. DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
  31.      DFFT1DU and SFFT1DU compute the 1 dimensional Fourier transform of a real
  32.      periodic sequence.
  33.  
  34.      NOTE: These routines are provided only for compatibility with previous
  35.      releases of complib.
  36.  
  37. PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
  38.      JJJJOOOOBBBB ---- IIIINNNNTTTTEEEEGGGGEEEERRRR
  39.      On entry specifies whether to perform a forward or backward Fast Fourier
  40.      Transform:
  41.          JOB = -1,  forward FFT
  42.          JOB =  1,  backward FFT Unchanged on exit.
  43.  
  44.      NNNN ---- IIIINNNNTTTTEEEEGGGGEEEERRRR....
  45.      On entry, N specifies the number of elements in the 1D FFT.  Unchanged on
  46.      exit.
  47.  
  48.      SSSSEEEEQQQQUUUUEEEENNNNCCCCEEEE ---- AAAArrrrrrrraaaayyyy....
  49.      Array of dimension at least 2*( (N+2)/2 ). On entry it contains the
  50.      elements for the FFT.  On exit, SEQUENCE is overwritten by the 1D
  51.      transform.
  52.  
  53.      IIIINNNNCCCC ---- IIIINNNNTTTTEEEEGGGGEEEERRRR....
  54.      Increment between two consecutive elements of the sequence.  Unchanged on
  55.      exit.
  56.  
  57.      WWWWOOOORRRRKKKKSSSSPPPPAAAACCCCEEEE ---- AAAArrrrrrrraaaayyyy....
  58.      Array of dimension at least N + 15.  On entry it contains the
  59.      Sines/Cosines and factorization of N.  WORKSPACE needs to be initialized
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  63.                                                                         PPPPaaaaggggeeee 1111
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  70. ssssfffffffftttt1111dddduuuu,,,,ddddfffffffftttt1111dddduuuu((((3333FFFF))))                                        ssssfffffffftttt1111dddduuuu,,,,ddddfffffffftttt1111dddduuuu((((3333FFFF))))
  71.  
  72.  
  73.  
  74.      by a call to sfft1dui or dfft1dui.
  75.  
  76.  
  77. SSSSEEEEEEEE AAAALLLLSSSSOOOO
  78.      o32fft
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  129.                                                                         PPPPaaaaggggeeee 2222
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