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: sn2individual.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/external/fieldtrip/utilities/private
    
    the code of the file until where you have to start completion: function [warped]= sn2individual(P, input)

% SN2INDIVIDUAL warps the input coordinates (defined as Nx3 matrix) from
% normalised MNI coordinates to individual headspace coordinates, using the
% warp parameters defined in the structure spmparams.
%
% this is modified from code from nutmeg: nut_mni2mri, which was itself
% modified from code originally written by John Ashburner:
% http://www.sph.umich.edu/~nichols/JG2/get_orig_coord2.m

if numel(P.Tr)==0,
  % only an affine transformation has been done
  T      = P.VF.mat*P.Affine/(P.VG.mat);

    
function [warped]= sn2individual(P, input)

% SN2INDIVIDUAL warps the input coordinates (defined as Nx3 matrix) from
% normalised MNI coordinates to individual headspace coordinates, using the
% warp parameters defined in the structure spmparams.
%
% this is modified from code from nutmeg: nut_mni2mri, which was itself
% modified from code originally written by John Ashburner:
% http://www.sph.umich.edu/~nichols/JG2/get_orig_coord2.m

if numel(P.Tr)==0,
  % only an affine transformation has been done
  T      = P.VF.mat*P.Affine/(P.VG.mat);
  warped = warp_apply(T, input);
else
  % we need the spm_dctmtx function for the nonlinear case
  ft_hastoolbox('spm8', 1);

  dim  = P.VG.dim(1:3);
  xyz  = warp_apply(inv(P.VG.mat), input); % goes into voxel coordinates
  
  basX = spm_dctmtx(dim(1), size(P.Tr,1), xyz(:,1)-1);
  basY = spm_dctmtx(dim(2), size(P.Tr,2), xyz(:,2)-1);
  basZ = spm_dctmtx(dim(3), size(P.Tr,3), xyz(:,3)-1);

  siz = size(P.Tr);
  Tr1 = reshape(P.Tr(:,:,:,1),siz(1)*siz(2),siz(3));
  Tr2 = reshape(P.Tr(:,:,:,2),siz(1)*siz(2),siz(3));
  Tr3 = reshape(P.Tr(:,:,:,3),siz(1)*siz(2),siz(3));
    
  xyztmp = zeros(size(xyz));
  for i=1:size(xyz,1)
    bx = basX(i,:);
	  by = basY(i,:);
	  bz = basZ(i,:);
	  tx = reshape(Tr1*bz', siz(1), siz(2) );
	  ty = reshape(Tr2*bz', siz(1), siz(2) );
	  tz = reshape(Tr3*bz', siz(1), siz(2) );
	  xyztmp(i,:) = [bx*tx*by' bx*ty*by' bx*tz*by'];
  end