function map=dftmap(edges,NFFT)
% dftmap - fmap, standard usage for DFT
%
% dftmap :: 
%    [[L]->0--0.5]   ~'normalised frequencies of edges',
%    N:natural       ~'DFT size'
% -> [[L+1,dftbins(N)]].

map=as_fmap(NFFT*edges,dftbins(NFFT));
