  This short paper is based on Chung et al. (2010), where the cosine series
representation (CSR) is used in modeling the shape of white matter fiber tracts
in diffusion tensor imaging(DTI) and Wang et al. (2018), where the method is
used to denoise EEG. The proposed explicit analytic approach offers far
superior flexibility in statistical modeling compared to the usual implicit
Fourier transform methods such as the discrete cosine transforms often used in
signal processing. The MATLAB codes and sample data can be obtained from
http://brainimaging.waisman.wisc.edu/~chung/tracts.
