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IRIX Base Documentation 1998 November
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IRIX 6.5.2 Base Documentation November 1998.img
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catman
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p_man
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cat3
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complib
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fft3dui.z
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fft3dui
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1998-10-30
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6KB
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133 lines
ssssccccfffffffftttt3333dddduuuuiiii,,,,ddddzzzzfffffffftttt3333dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt3333dddduuuuiiii,,,,ddddzzzzfffffffftttt3333dddduuuuiiii((((3333FFFF))))
NNNNAAAAMMMMEEEE
ssssccccfffffffftttt3333dddduuuuiiii,,,, ddddzzzzfffffffftttt3333dddduuuuiiii ---- initialize the coefficient array for real-to-
complex 3D FFT modules.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
_F_O_R_T_R_A_N _S_P_E_C_I_F_I_C_A_T_I_O_N
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee SSSSCCCCFFFFFFFFTTTT3333DDDDUUUUIIII(((( nnnn1111,,,, nnnn2222,,,, nnnn3333,,,, ccccooooeeeeffffffff ))))
iiiinnnntttteeeeggggeeeerrrr nnnn1111,,,, nnnn2222,,,, nnnn3333
rrrreeeeaaaallll ccccooooeeeeffffffff((((((((nnnn1111++++11115555)))) ++++ 2222****((((nnnn2222++++11115555)))) ++++ 2222****((((nnnn3333++++11115555))))))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee DDDDZZZZFFFFFFFFTTTT3333DDDDUUUUIIII(((( nnnn1111,,,, nnnn2222,,,, nnnn3333,,,, ccccooooeeeeffffffff ))))
iiiinnnntttteeeeggggeeeerrrr nnnn1111,,,, nnnn2222,,,, nnnn3333
rrrreeeeaaaallll****8888 ccccooooeeeeffffffff((((((((nnnn1111++++11115555)))) ++++ 2222****((((nnnn2222++++11115555)))) ++++ 2222****((((nnnn3333++++11115555))))))))
_C _S_P_E_C_I_F_I_C_A_T_I_O_N
####iiiinnnncccclllluuuuddddeeee <<<<fffffffftttt....hhhh>>>>
ffffllllooooaaaatttt ****ssssccccfffffffftttt3333dddduuuuiiii(((( iiiinnnntttt nnnn1111,,,, iiiinnnntttt nnnn2222,,,, nnnn3333,,,, ffffllllooooaaaatttt ****ccccooooeeeeffffffff))));;;;
ddddoooouuuubbbblllleeee ****ddddzzzzfffffffftttt3333dddduuuuiiii(((( iiiinnnntttt nnnn1111,,,, iiiinnnntttt nnnn2222,,,, nnnn3333,,,, ddddoooouuuubbbblllleeee ****ccccooooeeeeffffffff))));;;;
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
Initialize, the coefficient array which is used in the 3D FFT modules.
This array contains the different twiddle factors and the factorization
of N1, N2 and N3 into prime numbers.
As the FFT modules scfft3d or dzfft3d only read the _c_o_e_f_f array, it may
be reused as many times as necessary once it has been initialized.
In C, if _p_t_r is NULL, _s_c_f_f_t_3_d_u_i or _d_z_f_f_t_3_d_u_i returns a pointer to an
allocated buffer.
SCFFT3DUI should be used to initialize the coefficient array before any
call to SCFFT3DU
DZFFT3DUI should be used to initialize the coefficient array before any
call to DZFFT3DU
PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
NNNN1111 ---- Integer. Specifies the size of the first dimension of the 3D
sequence to be transformed. Unchanged on exit.
NNNN2222 ---- Integer. Specifies the size of the second dimension of the 3D
sequence to be transformed. Unchanged on exit.
NNNN3333 ---- Integer. Specifies the size of the third dimension of the 3D
sequence to be transformed. Unchanged on exit.
CCCCOOOOEEEEFFFFFFFF ---- Array (C or Fortran) or NULL pointer(C).
EEEExxxxaaaammmmpppplllleeee ooooffff CCCCaaaalllllllliiiinnnngggg SSSSeeeeqqqquuuueeeennnncccceeee
Initializing a coefficient array for real-to-complex FFTs of size 200 x
300 x 125.
PPPPaaaaggggeeee 1111
ssssccccfffffffftttt3333dddduuuuiiii,,,,ddddzzzzfffffffftttt3333dddduuuuiiii((((3333FFFF)))) ssssccccfffffffftttt3333dddduuuuiiii,,,,ddddzzzzfffffffftttt3333dddduuuuiiii((((3333FFFF))))
_F_o_r_t_r_a_n :
real coeff((200+15)+2*(300+15)+2*(125+15))
call scfft3dui( 200, 300, 125, coeff)
_C :
#include <fft.h>
float *coeff;
coeff = scfft3dui( 200, 300, 125, NULL);
SSSSEEEEEEEE AAAALLLLSSSSOOOO
fft, scfft3du, dzfft3du
PPPPaaaaggggeeee 2222