sgwt_delta.m

% sgwt_delta : Return vector with one nonzero entry equal to 1.
%
% function r=sgwt_delta(N,j)
%
% Returns length N vector with r(j)=1, all others zero
%
% Inputs :
% N - length of vector
% j - position of "delta" impulse
%
% Outputs:
% r - returned vector

% This file is part of the SGWT toolbox (Spectral Graph Wavelet Transform toolbox)
% Copyright (C) 2010, David K. Hammond. 
%
% The SGWT toolbox is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% The SGWT toolbox is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with the SGWT toolbox.  If not, see <http://www.gnu.org/licenses/>.

function r=sgwt_delta(N,j)
  r=zeros(N,1);
  r(j)=1;