function B = dftopm(N,M)%DFTOPM generates a DFT operator matrix B such that the discrete 1D-Fourier%  transform of a spatial vector x is given by X = B*x. The DFT is defined %  in the same way as the Matlab standard fft.% %  B = dftopm(N,M)%  Size of operator matrix (M x N).%  N = # spatial samples.%  M = # frequency samples.%%  The inverse discrete Fourier transform matrix is %  Bi = conj(dftopm(N,N))/N%%See Also%  dftopm2d, dftmtx%   *  DBT, A Matlab Toolbox for Radar Signal Processing  *% (c) FOA 1994-2000. See the file dbtright.m for copyright notice.%%  Start        : xxxxx Svante Bj鰎klund (svabj).%  Latest change: $Date: 2000/10/16 15:40:09 $ $Author: svabj $.%  $Revision: 1.4 $% *****************************************************************************if (nargin < 2)  M = N;end;  B = exp(-i*2*pi*(1/M)*(0:M-1).' * (0:N-1));