% -*- 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

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