irsa_idft

% -*- texinfo -*-
% @deftypefn {Function File} {irsa_idft.m}
% @var{yp} = irsa_dft (@var{fxp}, @var{fyp}, @var{xp}, [@var{lm}])
%
% Compute Inverse Discrete Fourier Transformations of spectra
% [@var{fxp},@var{fyp}] 
% using @code{@var{yp}(t) = (1/N) * sum_(k=1)^N @var{fyp}[k] *
% exp(2*pi*I*@var{fxp}[k]*t)} for every t in @var{xp}
% 
% Input:
%
% @var{fxp} : Columnvector -- frequency points
%
% @var{fyp} : Matrix with the spectrum values in its columns 
%
% @var{xp}  : Vector -- sampling points for the resulting timeseries
%
% @var{lm}  : Boolean -- use lesser memory if 'true' (slower). Default
% is 'false'.  
%
% Output:
%
% @var{yp}   : Matrix with values of the IDFTs in its columns
% @end deftypefn