You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tfocs_interface.m
    path of file: ./repos/lrslibrary/algorithms/rpca/TFOCS
    
    the code of the file until where you have to start completion: %% [matrix matrix] tfocs_interface(matrix)
% M - 2d matrix
% L - low rank matrix
% S - sparse matrix
%
function [L, S] = tfocs_interface(M,constraint)
  X = M;
  %lambda = 1/sqrt(min(size(M,1),size(M,2))); 
  lambda  = 1e-2;
  largescale = false;
  opts = [];
  opts.stopCrit       = 4;
  opts.printEvery     = 1;
  opts.tol            = 1e-4;
  opts.maxIts         = 25;
  opts.errFcn{1}      = @(f,d,p) norm(p
    
function [L, S] = tfocs_interface(M,constraint)
  X = M;
  %lambda = 1/sqrt(min(size(M,1),size(M,2))); 
  lambda  = 1e-2;
  largescale = false;
  opts = [];
  opts.stopCrit       = 4;
  opts.printEvery     = 1;
  opts.tol            = 1e-4;
  opts.maxIts         = 25;
  opts.errFcn{1}      = @(f,d,p) norm(p{1}+p{2}-X,'fro')/norm(X,'fro');
  
  for inequality_constraints = 0:1
      if inequality_constraints
          % if we already have equality constraint solution,
          %   it would make sense to "warm-start":
  %         x0      = { LL_0, SS_0 };
          % but it's more fair to start all over:
          x0      = { X, zeros(size(X))   };
          z0      = [];
      else
          x0      = { X, zeros(size(X))   };
          z0      = [];
      end