% -*- texinfo -*-
% @deftypefn {Function File} {@var{d} = } dftmtx (@var{n})
%
% If @var{n} is a scalar, produces a @var{n}-by-@var{n} matrix @var{d}
% such that the Fourier transform of a column vector of length @var{n}
% is given by @code{dftmtx(@var{n}) * x} and the inverse Fourier transform
% is given by @code{inv(dftmtx(@var{n})) * x}. In general this is less
% efficient than calling the @dfn{fft} and @dfn{ifft} directly.
% @end deftypefn