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: spm_orientations.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8
    
    the code of the file until where you have to start completion: function spm_orientations(P)
% Show the orientations that SPM assumes that the data are
% stored in.  Standard Analyze format axial images will
% normally be reported as 'RPI   Left-handed'.  Some people
% will represent their axial images as Right-handed.
% 'RPI' means that the fastest changing direction (i.e.
% the first element of the voxel coordinate) in the
% file is Right->left, the middle (second element of

    
function spm_orientations(P)
% Show the orientations that SPM assumes that the data are
% stored in.  Standard Analyze format axial images will
% normally be reported as 'RPI   Left-handed'.  Some people
% will represent their axial images as Right-handed.
% 'RPI' means that the fastest changing direction (i.e.
% the first element of the voxel coordinate) in the
% file is Right->left, the middle (second element of
% voxel coordinate) is Posterior->anterior and the
% slowest (third element - indicating slice number) is
% Inferior->superior.
%
% One thing to watch out for is the image orientation. The
% proper Analyze format uses a left-handed co-ordinate system,
% whereas Talairach uses a right-handed one. In SPM99, images
% were flipped at the spatial normalisation stage (from one
% co-ordinate system to the other). In SPM2, a different
% approach is used, so that either a left- or right-handed
% co-ordinate system is used throughout. The SPM2 program is
% told about the handedness that the images are stored with by
% the spm_flip_analyze_images.m function and the
% defaults.analyze.flip parameter that is specified in the
% spm_defaults.m file. These files are intended to be
% customised for each site. If you previously used SPM99 and
% your images were flipped during spatial normalisation, then
% set defaults.analyze.flip=1. If no flipping took place, then
% set defaults.analyze.flip=0.
%
% Check that when using the Display facility (possibly after
% specifying some rigid-body rotations) that:
%
%     * The top-left image is coronal with the top (superior)
%       of the head displayed at the top and the left shown on
%       the left. This is as if the subject is viewed from
%       behind.
%
%     * The bottom-left image is axial with the front
%       (anterior) of the head at the top and the left shown
%       on the left. This is as if the subject is viewed from
%       above.
%
%     * The top-right image is sagittal with the front
%       (anterior) of the head at the left and the top of the
%       head shown at the top. This is as if the subject is
%       viewed from the left.

%_______________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% John Ashburner
% $Id: spm_orientations.m 3131 2009-05-18 15:54:10Z guillaume $

if nargin<1,
    P = spm_select(Inf,'image','Select the images...');
end