Symmetry: When the region between 0 and fs is examined, it can be seen that there is even symmetry around the center point, 0.5fs. 4. Matlab and the FFT Matlab's FFT function is an effective tool for computing the discrete Fourier transform of a signal.The following code examples will help you to understand the details of using the FFT function.ymmetry: When the region between 0 and fs is examined, it can be seen that there is even symmetry around the center point, 0.5fs. 4. Matlab and the FFT Matlab's FFT function is an effective tool for computing the discrete Fourier transform of a signal.