#!F-adobe-helvetica-medium-r-normal--18* #!N #!N #!Rfft FFT #!N #!N Category #!N #!N #!Lcattrn,dxall763 h Transformation #!EL #!N #!N Function #!N #!N Computes a fast Fourier transform. #!N #!N Syntax #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N #!F-adobe-times-bold-r-normal--18* output #!EF = FFT( #!F-adobe-times-bold-r-normal--18* input #!EF , #!F-adobe-times-bold-r-normal--18* direction #!EF , #!F-adobe-times-bold-r-normal--18* center #!EF ); #!EF #!N #!N #!EC #!N #!N Inputs #!T,1,91,276,461,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Default TAB Description #!EF #!N TAB input TAB field TAB none TAB field to be transformed #!N TAB direction TAB string TAB "forward" TAB direction of the transform #!N TAB center TAB flag TAB 0 TAB center the result of the transform #!N TAB - TAB - TAB - TAB #!EF #!N #!N Outputs #!T,1,161,321,646 #!F-adobe-times-medium-r-normal--14* #!F-adobe-times-bold-r-normal--18* #!N TAB Name TAB Type TAB Description #!EF #!N TAB output TAB field TAB transformed data #!N TAB - TAB - TAB #!EF #!N #!N Functional Details #!N #!N This module computes the fast Fourier transform of a 2- or 3-dimensional regular data set. #!N #!I0 #!N #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* input #!EF #!EF #!I50 #!N specifies the field to be transformed. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* direction #!EF #!EF #!I50 #!N is one of the following: "forward," "inverse," or "backward" (the last two are interchangeable). #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* center #!EF #!EF #!I50 #!N specifies whether zero frequency should be placed at the center of the transformed field or at the origin of the positions array. #!I0 #!N #!N Note: This module requires that the number of data items in each dimension be a power of 2. If it is not, use the DFT module. #!N #!N Components #!N #!N All scalar components of #!F-adobe-times-bold-r-normal--18* input #!EF are individually Fourier-transformed and output as complex float. All other input components are propagated to the output. Thus a float 2-vector input produces a complex 2-vector output. #!N #!N Example Visual Programs #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N FFT.net #!EF #!N #!N #!EC #!N #!N See Also #!N #!N #!Ldft,dxall801 h DFT #!EL , #!Lfilter,dxall849 h Filter #!EL , #!Lmorph,dxall896 h Morph #!EL #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lfacenor,dxall847 h FaceNormals #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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