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: correct_tpm2one.m
    path of file: ./repos/cat12/development
    
    the code of the file until where you have to start completion: function correct_tpm2one
% correct last class of TPM or GS-Template to ensure sum=1

P = spm_select(Inf,'image','Select TPMs or GS-Templates');

for i=1:size(P,1)
  N = nifti(deblank(P(i,:)));

    
function correct_tpm2one
% correct last class of TPM or GS-Template to ensure sum=1

P = spm_select(Inf,'image','Select TPMs or GS-Templates');

for i=1:size(P,1)
  N = nifti(deblank(P(i,:)));
  dat = zeros(N.dat.dim);
  dat(:,:,:,:) = N.dat(:,:,:,:);
  nc = N.dat.dim(4);  
  sum_dat = sum(dat(:,:,:,1:(nc-1)),4);
  sum_dat(sum_dat>1) = 1;
  
  % correct last class and ensure sum=1
  dat(:,:,:,nc) = 1 - sum_dat;
  
  [pth,nam,ext] = spm_fileparts(N.dat.fname);

  % write corrected TPM
  No = nifti;
  No.dat  = file_array(fullfile(pth,['c' nam ext]),size(dat),N.dat.dtype,...
      N.dat.offset,N.dat.scl_slope,N.dat.scl_inter);
  No.mat  = N.mat;
  No.mat0 = N.mat;
  No.descrip = N.descrip;
  create(No);
  No.dat(:,:,:,:) = dat(:,:,:,:);
end