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: CreateEmptyAtlas.m
    path of file: ./repos/CBIG/external_packages/SD/SDv1.5.1-svn593/SphericalDemons
    
    the code of the file until where you have to start completion: % Contact ythomas@csail.mit.edu or msabuncu@csail.mit.edu for bugs or questions 
%
%===================================
    
function SD_atlas = CreateEmptyAtlas(hemi)

SD_atlas.zrotate = pi/90;
SD_atlas.yrotate = pi/90;
SD_atlas.radius = 100;
SD_atlas.basic_atlas = [];

% These parameters are mostly used for reading subjects and meshes

% parameters to be filled
if(nargin == 1)
    SD_atlas.parms.hemi = hemi;
else
    SD_atlas.parms.hemi = 'lh';
end