c_o_m

PURPOSE

SYNOPSIS

DESCRIPTION

 c_o_m method - calculates unweighted centre of mass

 $Id$

CROSS-REFERENCE INFORMATION

• native_space native_space method - returns native space of object
• realpts realpts method - returns 3xN XYZ matrix in mm
• voxpts voxpts method - voxels within a box in given space
• native_space native_space method - returns native space of object
• voxpts voxpts method - returns 3xN ijk matrix in voxels
• native_space native_space method - returns native space of object
• voxpts voxpts method - returns 3xN ijk matrix in voxels
• voxpts voxpts method - voxels within a sphere in given space

• mars_build_roi builds ROIs via the SPM GUI
• mars_display_roi utility routines for display of ROIs in graphic window

SOURCE CODE

0001 function pt = c_o_m(o, sp, pt_type)
0002 % c_o_m method - calculates unweighted centre of mass
0003 %
0004 % $Id$
0005 
0006 if nargin < 2
0007   sp = native_space(o);
0008 end
0009 if nargin < 3
0010   pt_type = 'real';
0011 end
0012 coords = voxpts(o, sp);
0013 switch pt_type
0014  case {'real','mm'}
0015   coords = realpts(o, sp);
0016  case 'vox'
0017   coords = voxpts(o, sp);
0018  otherwise
0019   error(['Do not recognize point type' pt_type]);
0020 end
0021 pt = mean(coords, 2);