vb_analyze_to_spm_right

 change Analyze Left-hand voxcel coordinate to Right-hand SPM (m) coord.
  Vspm = vb_analyze_to_spm_right(Vana)            : normal vector
  Vspm = vb_analyze_to_spm_right(Vana,Vdim,Vsize) : coordinate vector
  Vspm = vb_analyze_to_spm_right(Vana,Vdim,Vsize,nflag)
 --- Input
 Vana  : NV x 3 Analyze Left-hand voxcel coordinate
 Vdim  : Voxel dimension of Analyze image
 Vsize : Voxel size of Analyze image
 nflag = 1 : normal vector : no translation and scaling is applied
 --- Output
 Vspm  : NV x 3 Right-hand SPM (m) coord.

 --- Analyze voxcel coordinate   

 [Left-hand coordinate]
 X: Right(1)  -> Left(191) 
 Y: Back(1)   -> Front(256)
 Z: Bottom(1) -> Top(256) 

 --- SPM coordinate   

 [Right-hand coordinate]
 X: Left(-191/2)   -> Right(191/2) 
 Y: Back(-256/2)   -> Front(256/2)
 Z: Bottom(-256/2) -> Top(256/2) 

 written by M. Sato  2005-8-1

 Copyright (C) 2011, ATR All Rights Reserved.
 License : New BSD License(see VBMEG_LICENSE.txt)

0001 function    Vspm = vb_analyze_to_spm_right(Vana,Vdim,Vsize,nflag)
0002 % change Analyze Left-hand voxcel coordinate to Right-hand SPM (m) coord.
0003 %  Vspm = vb_analyze_to_spm_right(Vana)            : normal vector
0004 %  Vspm = vb_analyze_to_spm_right(Vana,Vdim,Vsize) : coordinate vector
0005 %  Vspm = vb_analyze_to_spm_right(Vana,Vdim,Vsize,nflag)
0006 % --- Input
0007 % Vana  : NV x 3 Analyze Left-hand voxcel coordinate
0008 % Vdim  : Voxel dimension of Analyze image
0009 % Vsize : Voxel size of Analyze image
0010 % nflag = 1 : normal vector : no translation and scaling is applied
0011 % --- Output
0012 % Vspm  : NV x 3 Right-hand SPM (m) coord.
0013 %
0014 % --- Analyze voxcel coordinate
0015 %
0016 % [Left-hand coordinate]
0017 % X: Right(1)  -> Left(191)
0018 % Y: Back(1)   -> Front(256)
0019 % Z: Bottom(1) -> Top(256)
0020 %
0021 % --- SPM coordinate
0022 %
0023 % [Right-hand coordinate]
0024 % X: Left(-191/2)   -> Right(191/2)
0025 % Y: Back(-256/2)   -> Front(256/2)
0026 % Z: Bottom(-256/2) -> Top(256/2)
0027 %
0028 % written by M. Sato  2005-8-1
0029 %
0030 % Copyright (C) 2011, ATR All Rights Reserved.
0031 % License : New BSD License(see VBMEG_LICENSE.txt)
0032 
0033 if nargin == 1,
0034     nflag = 1;
0035 elseif nargin < 4, 
0036     nflag = 0; 
0037 end;
0038 
0039 if nflag == 1, 
0040     Vspm(:,1) = -Vana(:,1);
0041     return; 
0042 end;
0043 
0044 NV   = size(Vana,1);
0045 Vspm = zeros(NV,3);
0046 
0047 Vspm(:,1) = -( Vana(:,1) - Vdim(1)*0.5 )*Vsize(1);
0048 Vspm(:,2) =  ( Vana(:,2) - Vdim(2)*0.5 )*Vsize(2);
0049 Vspm(:,3) =  ( Vana(:,3) - Vdim(3)*0.5 )*Vsize(3);
0050 
0051 % Change [mm] to [m]
0052 Vspm = Vspm*0.001;