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- ssssccccfffffffftttt2222dddduuuuiiii,,,,ddddzzzzfffffffftttt2222dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt2222dddduuuuiiii,,,,ddddzzzzfffffffftttt2222dddduuuuiiii((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- ssssccccfffffffftttt2222dddduuuuiiii,,,, ddddzzzzfffffffftttt2222dddduuuuiiii ---- initialize the coefficient array for real-to-
- complex 2D 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 SSSSCCCCFFFFFFFFTTTT2222DDDDUUUUIIII(((( nnnn1111,,,, nnnn2222,,,, ccccooooeeeeffffffff ))))
- iiiinnnntttteeeeggggeeeerrrr nnnn1111,,,, nnnn2222
- rrrreeeeaaaallll ccccooooeeeeffffffff((((((((nnnn1111++++11115555)))) ++++ 2222****((((nnnn2222++++11115555))))))))
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- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee DDDDZZZZFFFFFFFFTTTT2222DDDDUUUUIIII(((( nnnn1111,,,, nnnn2222,,,, ccccooooeeeeffffffff ))))
- iiiinnnntttteeeeggggeeeerrrr nnnn1111,,,, nnnn2222
- rrrreeeeaaaallll****8888 ccccooooeeeeffffffff((((((((nnnn1111++++11115555)))) ++++ 2222****((((nnnn2222++++11115555))))))))
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- _C _S_P_E_C_I_F_I_C_A_T_I_O_N
- ####iiiinnnncccclllluuuuddddeeee <<<<fffffffftttt....hhhh>>>>
- ffffllllooooaaaatttt ****ssssccccfffffffftttt2222dddduuuuiiii(((( iiiinnnntttt nnnn1111,,,, iiiinnnntttt nnnn2222,,,, ffffllllooooaaaatttt ****ccccooooeeeeffffffff))));;;;
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- ddddoooouuuubbbblllleeee ****ddddzzzzfffffffftttt2222dddduuuuiiii(((( iiiinnnntttt nnnn1111,,,, iiiinnnntttt nnnn2222,,,, ddddoooouuuubbbblllleeee ****ccccooooeeeeffffffff))));;;;
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- Initialize, the coefficient array which is used in the 2D FFT modules.
- This array contains the different twiddle factors and the factorization
- of N1 and N2 into prime numbers.
- As the FFT modules scfft2d or dzfft2d only read the _c_o_e_f_f array, it may
- be reused as many times as necessary once it has been initialized.
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- In C, if _p_t_r is NULL, _s_c_f_f_t_2_d_u_i or _d_z_f_f_t_2_d_u_i returns a pointer to an
- allocated buffer.
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- SCFFT2DUI should be used to initialize the coefficient array before any
- call to SCFFT2DU
- DZFFT2DUI should be used to initialize the coefficient array before any
- call to DZFFT2DU
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- PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
- NNNN1111 ---- Integer. Specifies the size of the first dimension of the 2D
- sequence to be transformed. Unchanged on exit.
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- NNNN2222 ---- Integer. Specifies the size of the second dimension of the 2D
- 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 x
- 300.
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- _F_o_r_t_r_a_n :
- real coeff((200+15)+2*(300+15))
- call scfft2dui( 200, 300, coeff)
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- PPPPaaaaggggeeee 1111
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- ssssccccfffffffftttt2222dddduuuuiiii,,,,ddddzzzzfffffffftttt2222dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt2222dddduuuuiiii,,,,ddddzzzzfffffffftttt2222dddduuuuiiii((((3333FFFF))))
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- _C :
- #include <fft.h>
- float *coeff;
- coeff = scfft2dui( 200, 300, NULL);
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- fft, scfft2du, dzfft2du
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- PPPPaaaaggggeeee 2222
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