sgwt_soft_threshold : Soft thresholding operator x_t = bpdq_soft_threshold(x,tgamma) Applies soft thresholding to each component of x Inputs: x - input signal tgamma - threshold Outputs: x_t - soft thresholded result
0001 % sgwt_soft_threshold : Soft thresholding operator 0002 % 0003 % x_t = bpdq_soft_threshold(x,tgamma) 0004 % 0005 % Applies soft thresholding to each component of x 0006 % 0007 % Inputs: 0008 % x - input signal 0009 % tgamma - threshold 0010 % 0011 % Outputs: 0012 % x_t - soft thresholded result 0013 0014 % This file is part of the SGWT toolbox (Spectral Graph Wavelet Transform toolbox) 0015 % Copyright (C) 2010, David K. Hammond. 0016 % 0017 % The SGWT toolbox is free software: you can redistribute it and/or modify 0018 % it under the terms of the GNU General Public License as published by 0019 % the Free Software Foundation, either version 3 of the License, or 0020 % (at your option) any later version. 0021 % 0022 % The SGWT toolbox is distributed in the hope that it will be useful, 0023 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0024 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0025 % GNU General Public License for more details. 0026 % 0027 % You should have received a copy of the GNU General Public License 0028 % along with the SGWT toolbox. If not, see <http://www.gnu.org/licenses/>. 0029 0030 0031 function x_t = sgwt_soft_threshold(x,tgamma) 0032 tmp=abs(x)-tgamma; 0033 x_t = sign(x).*tmp.*(tmp>0); 0034