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- ssssccccfffffffftttt1111dddduuuuiiii,,,,ddddzzzzfffffffftttt1111dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt1111dddduuuuiiii,,,,ddddzzzzfffffffftttt1111dddduuuuiiii((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- ssssccccfffffffftttt1111dddduuuuiiii,,,, ddddzzzzfffffffftttt1111dddduuuuiiii ---- initialize the coefficient array for real-to-
- complex 1D FFT modules.
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- SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
- _F_O_R_T_R_A_N _S_P_E_C_I_F_I_C_A_T_I_O_N
- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee SSSSCCCCFFFFFFFFTTTT1111DDDDUUUUIIII(((( nnnn,,,, ccccooooeeeeffffffff ))))
- iiiinnnntttteeeeggggeeeerrrr nnnn
- rrrreeeeaaaallll ccccooooeeeeffffffff((((nnnn++++11115555))))
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- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee DDDDZZZZFFFFFFFFTTTT1111DDDDUUUUIIII(((( nnnn,,,, ccccooooeeeeffffffff ))))
- iiiinnnntttteeeeggggeeeerrrr nnnn
- rrrreeeeaaaallll****8888 ccccooooeeeeffffffff((((nnnn++++11115555))))
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- _C _S_P_E_C_I_F_I_C_A_T_I_O_N
- ####iiiinnnncccclllluuuuddddeeee <<<<fffffffftttt....hhhh>>>>
- ffffllllooooaaaatttt ****ssssccccfffffffftttt1111dddduuuuiiii(((( iiiinnnntttt nnnn,,,, ffffllllooooaaaatttt ****ccccooooeeeeffffffff))));;;;
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- ddddoooouuuubbbblllleeee ****ddddzzzzfffffffftttt1111dddduuuuiiii(((( iiiinnnntttt nnnn,,,, ddddoooouuuubbbblllleeee ****ccccooooeeeeffffffff))));;;;
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- Initialize, the coefficient array which is used in the FFT modules. This
- array contains the different twiddle factors and the factorization of N
- into prime numbers.
- As the FFT modules scfft1d or dzfft1d only read the _c_o_e_f_f array, it may
- be reused as long as necessary once it has been initialized.
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- In C, if _p_t_r is NULL, _s_c_f_f_t_1_d_u_i or _d_z_f_f_t_1_d_u_i returns a pointer to an
- allocated buffer.
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- SCFFT1DUI should be used to initialize the coefficient array before any
- call to SCFFT1DU
- DZFFT1DUI should be used to initialize the coefficient array before any
- call to DZFFT1DU
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- PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
- NNNN ---- Integer. Specifies the length of the sequence to be transformed.
- Unchanged on exit.
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- CCCCOOOOEEEEFFFFFFFF ---- Array (C or Fortran) or NULL pointer(C).
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- EEEExxxxaaaammmmpppplllleeee ooooffff CCCCaaaalllllllliiiinnnngggg SSSSeeeeqqqquuuueeeennnncccceeee
- Initializing a coefficient array for real-to-complex FFTs of size 200.
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- _F_o_r_t_r_a_n :
- float coeff(200+15)
- call scfft1dui( 200, coeff)
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- _C :
- #include <fft.h>
- float *coeff;
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- PPPPaaaaggggeeee 1111
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- ssssccccfffffffftttt1111dddduuuuiiii,,,,ddddzzzzfffffffftttt1111dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt1111dddduuuuiiii,,,,ddddzzzzfffffffftttt1111dddduuuuiiii((((3333FFFF))))
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- coeff = scfft1dui( 200, NULL);
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- fft, scfft1du, dzfft1du
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- PPPPaaaaggggeeee 2222
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