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I suspect the prox_l2_grad is not doing what it should for 2D. Try to replace TV with Tikhonov into demo_douglas_rachford.m...

I encounter the issue of ' undefined function or variable 'postpad' ' , when I try to run demo_admm. I don't know what is the depended-upon module of this function. And I already install and start those two packages :

The LTFAT toolbox (For sound demo)
The GSPBox (Graph signal processing toolbox)

Do I still miss some module?
The error information is shown below:

UnLocBoX version 1.7.4. Copyright 2012-2015 LTS2-EPFL, by Nathanael Perraudin
LTFAT version 2.4.0. Copyright 2005-2018 Peter L. Soendergaard. For help, please type "ltfathelp". LTFAT is using the script language backend.
(Your global and persistent variables have just been cleared. Sorry.)
The time step is set manually to : 1
Algorithm selected: ADMM
Iter 001: 未定义函数或变量 'postpad'。
出错 ifwt (line 154)
f = postpad(f,Ls);
出错 ifwt2 (line 94)
c(colRange,rowRange) = ifwt(c(colRange,rowRange),w,Jstep,Lcrows(LcIdx),'dim',1,'per');
出错 demo_admm>@(x)ifwt2(x,'db8',6)
出错 demo_admm>@(x,T)(1+tauTmask).^(-1).(Lt(x)+tauT*mask.*z)
出错 admm_alg>admm_algorithm (line 76)
s.x_n{1} = Fp{s.ind(1)}.proxL(s.x_n{2} - s.u_n,s.gamma);
出错 admm_alg>@(x_0,fg,Fp,sol,s,param)admm_algorithm(Fp,s) (line 4)
s.algorithm = @(x_0, fg, Fp, sol, s, param) admm_algorithm(Fp, s);
出错 solvep (line 223)
[sol, s] = algo.algorithm(x_0, fg, Fp, sol, s, param);
出错 admm (line 87)
[sol, info] = solvep(x_0,{f1,f2},param);
出错 demo_admm (line 175)
sol = admm(z, f1, f2, paramsolver);