cI()

function out=cI(in)

Input:

• in: $d=3$ dimensional data stored as an $\prod_k S_k\,\times\,1$ vector

Global variables:

• gbl_S: dimensions of $d=3$ dimensional data set

Output:

• out: cI operator applied to in

Write a file ``cI.m'' containing a function of the above specification. To carry out the forward transform using FFTW, copy the file ``fft3.m'' from Appendix E into ``$\sim$/A1''. To use this function, note that fft3(dat,S,1) returns the discrete Fourier sum with sign $+i$ in the exponential for data of dimension S(1)$\times$S(2)$\times$S(3). (For more information, enter ``help fft3''once you've copied ``fft3.m''.)
NOTE: The remote login machine remote.physics.cornell.edu runs an older version of octave that doesn't have FFTW installed. If you work remotely, you will have to first ssh into one of the workstations ws01, ws02, .... If you log directly into a workstation, this is not an issue.