% test_decreasing_1d - test the 2D alpert transform for a C^alpha signal.
% If the Alpert basis has more than alpha vanishing moments
% (check the value of k), then the decreasing of the error
% of reconstruction with M coefficients should be like
% |f-f_M| ~ M^{-alpha}
%
%   Copyright (c) 2004 Gabriel Peyr