fft { <range> } <function name>() of ( <filename> | <function name>() ) [ using { <expression> } ] ifft { <range> } <function name>() of ( <filename> | <function name>() ) [ using { <expression> } ]
The fft command calculates Fourier transforms of data files or functions. Transforms can be performed on datasets with arbitrary numbers of dimensions. To transform an algebraic expression with n
f(i_2,i_2,…,i_n)
n
n
n
n+1
n