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% <a href="matlab: edit rvar/xsf">XSF</a>  Power spectrum and spectral density functions.
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% Syntax:
%   [S,D] = xsf(w,freq)
% Output arguments:
%   S [ numeric ] Power spectrum function.
%   D [ numeric ] Spectral density function.
% Required input arguments:
%   w [ svar ] SVAR model.
%   freq [ numeric ] Frequencies at which XSF is to be evaluated.
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% This function is inherited from RVAR class.
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% The IRIS Toolbox 2007/10/11. Copyright 2007 Jaromir Benes. <a href="http://www.iris-toolbox.com">www.iris-toolbox.com</a>
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