5.8.1 Window functions
A range of commonly-used window functions may automatically be applied to data as it is read into the fft and ifft commands; these are listed together with their algebraic forms in Table 5.1 and shown in Figure 5.1. In each case, the window functions are given for sample number , which ranges between and . The window functions may be invoked using the following syntax:
fft [...] <out>() of <in>() window <window_name>
Where multi-dimensional FFTs are performed, window functions are applied to each dimension in turn. Other arbitrary window functions may be implemented by pre-multiplying data before entry to the fft and ifft commands.