Boltzmann is not calculated when opt.Method = 'eig' , Exp.Temperature is invalid.

[cerium1925]

For algorithms using general eigenvalue problems, when opt.Method = 'eig', the Boltzmann distribution is not calculated. In fact, there is no relevant calculation code in the original code of resfields_eig. Peak intensity calculation in the Matrix method is complete and includes all factors that may affect peak intensity.

[cerium1925]

Is it possible to leverage the results calculated by opt.Method = 'Matrix' for the Boltzmann distribution, returning Eu and Ev? Naturally, this could be an optional approach.