diff --git a/.gitignore b/.gitignore
index 9874cac..18b1b88 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ kernel/matrixfree/.svn
 *.o
 temp
 *.
+*.asv
\ No newline at end of file
diff --git a/kernel/distances/NCCmexC.mexw64 b/kernel/distances/NCCmexC.mexw64
new file mode 100755
index 0000000..5834aa2
Binary files /dev/null and b/kernel/distances/NCCmexC.mexw64 differ
diff --git a/kernel/distances/NGFdotMexC.mexw64 b/kernel/distances/NGFdotMexC.mexw64
new file mode 100755
index 0000000..a575ed4
Binary files /dev/null and b/kernel/distances/NGFdotMexC.mexw64 differ
diff --git a/kernel/distances/SSDmexC.mexw64 b/kernel/distances/SSDmexC.mexw64
new file mode 100755
index 0000000..e76bd7d
Binary files /dev/null and b/kernel/distances/SSDmexC.mexw64 differ
diff --git a/kernel/distances/rhoSplineC.mexw64 b/kernel/distances/rhoSplineC.mexw64
new file mode 100755
index 0000000..44e4ba0
Binary files /dev/null and b/kernel/distances/rhoSplineC.mexw64 differ
diff --git a/kernel/distances/testDistances.m b/kernel/distances/testDistances.m
index dc09e07..620bfec 100644
--- a/kernel/distances/testDistances.m
+++ b/kernel/distances/testDistances.m
@@ -5,7 +5,8 @@
 % - https://github.com/C4IR and
 % - http://www.siam.org/books/fa06/
 %==============================================================================
-% This is a testing environment for the files in the folder kernel/data
+% This is a testing environment for the files in the folder
+% kernel/distances
 % 1. Based on data/contents, a list of required files is generated and it 
 %    is verified, that all files are present; additional files are listed.
 % 2. All c-files are compiled.
diff --git a/kernel/imgModels/linearInterMexC.mexw64 b/kernel/imgModels/linearInterMexC.mexw64
new file mode 100755
index 0000000..db3a563
Binary files /dev/null and b/kernel/imgModels/linearInterMexC.mexw64 differ
diff --git a/kernel/imgModels/linearInterSmoothMexC.mexw64 b/kernel/imgModels/linearInterSmoothMexC.mexw64
new file mode 100755
index 0000000..fcc8bb3
Binary files /dev/null and b/kernel/imgModels/linearInterSmoothMexC.mexw64 differ
diff --git a/kernel/imgModels/nnInterMexC.mexw64 b/kernel/imgModels/nnInterMexC.mexw64
new file mode 100755
index 0000000..1e10b18
Binary files /dev/null and b/kernel/imgModels/nnInterMexC.mexw64 differ
diff --git a/kernel/imgModels/splineInterMexC.mexw64 b/kernel/imgModels/splineInterMexC.mexw64
new file mode 100755
index 0000000..f29dbd3
Binary files /dev/null and b/kernel/imgModels/splineInterMexC.mexw64 differ
diff --git a/kernel/imgModels/testOneImgModel.m b/kernel/imgModels/testOneImgModel.m
index 5c0bb76..659d9e0 100644
--- a/kernel/imgModels/testOneImgModel.m
+++ b/kernel/imgModels/testOneImgModel.m
@@ -29,10 +29,10 @@ function testOneImgModel(file)
   coeff = @(Tdata,dim) getSplineCoefficients(Tdata,'dim',dim);
 end
 
-fprintf(2,'%s: test implementation of <%s>, run minimal examples\n',...
+fprintf(1,'%s: test implementation of <%s>, run minimal examples\n',...
   mfilename,file)
 
-fprintf(2,'check <%s> on 1D example\n',file);
+fprintf(1,'check <%s> on 1D example\n',file);
 Tdata     = [0,1,4,1,0];
 omega     = [0,10];
 m         = length(Tdata);
@@ -51,7 +51,7 @@ function testOneImgModel(file)
 title('dT')
 
 
-fprintf(2,'check <%s> on 2D example\n',mfilename);
+fprintf(1,'check <%s> on 2D example\n',mfilename);
 omega = [0,10,0,8];
 Tdata = [1,2,3,4;1,2,3,4;4,4,4,4]; m = size(Tdata);
 Tcoef = coeff(Tdata,2);
@@ -69,7 +69,7 @@ function testOneImgModel(file)
 title('dT')
 
 
-fprintf(2,'check <%s> on 3D example\n',mfilename);
+fprintf(1,'check <%s> on 3D example\n',mfilename);
 omega = [0,1,0,2,0,1]; m = [13,16,7];
 Xdata    = getCellCenteredGrid(omega,m);
 Y     = reshape(Xdata,[m,3]);
@@ -84,7 +84,7 @@ function testOneImgModel(file)
 subplot(1,2,2); spy(dT);                 
 title('dT')
 
-fprintf(2,'run derivative test for <%s> (note: needs to fail)\n',mfilename);
+fprintf(1,'run derivative test for <%s> (note: needs to fail)\n',mfilename);
 fctn = @(xc) feval(file,Tcoef,omega,xc);
 xc   = xc + rand(size(xc));
 FAIRfigure(4);
diff --git a/kernel/landmarks/TPSmexC.mexw64 b/kernel/landmarks/TPSmexC.mexw64
new file mode 100755
index 0000000..92b2571
Binary files /dev/null and b/kernel/landmarks/TPSmexC.mexw64 differ
diff --git a/kernel/landmarks/testLandmarks.m b/kernel/landmarks/testLandmarks.m
index ce21514..8bd0431 100644
--- a/kernel/landmarks/testLandmarks.m
+++ b/kernel/landmarks/testLandmarks.m
@@ -5,7 +5,8 @@
 % - https://github.com/C4IR and
 % - http://www.siam.org/books/fa06/
 %==============================================================================
-% This is a testing environment for the files in the folder kernel/data
+% This is a testing environment for the files in the folder
+% kernel/landmarks
 % 1. Based on data/contents, a list of required files is generated and it 
 %    is verified, that all files are present; additional files are listed.
 % 2. All c-files are compiled.
diff --git a/kernel/numerics/checkDerivative.m b/kernel/numerics/checkDerivative.m
index 86ad45e..105b6f5 100644
--- a/kernel/numerics/checkDerivative.m
+++ b/kernel/numerics/checkDerivative.m
@@ -58,6 +58,7 @@
   dvf = df*v; 
 elseif isa(df,'function_handle'),
   dvf = df(v);
+  if isrow(dvf); dvf = dvf'; end; 
 else
   keyboard;
 end;
diff --git a/kernel/numerics/nodal2centerC.mexw64 b/kernel/numerics/nodal2centerC.mexw64
new file mode 100755
index 0000000..89e3da9
Binary files /dev/null and b/kernel/numerics/nodal2centerC.mexw64 differ
diff --git a/kernel/regularizers/curvatureDiagMex.mexw64 b/kernel/regularizers/curvatureDiagMex.mexw64
new file mode 100755
index 0000000..8a61f33
Binary files /dev/null and b/kernel/regularizers/curvatureDiagMex.mexw64 differ
diff --git a/kernel/regularizers/curvatureHessianMex.mexw64 b/kernel/regularizers/curvatureHessianMex.mexw64
new file mode 100755
index 0000000..712599b
Binary files /dev/null and b/kernel/regularizers/curvatureHessianMex.mexw64 differ
diff --git a/kernel/regularizers/curvatureMexC.mexw64 b/kernel/regularizers/curvatureMexC.mexw64
new file mode 100755
index 0000000..1379d84
Binary files /dev/null and b/kernel/regularizers/curvatureMexC.mexw64 differ
diff --git a/kernel/regularizers/geometryMexC.mexw64 b/kernel/regularizers/geometryMexC.mexw64
new file mode 100755
index 0000000..d53e567
Binary files /dev/null and b/kernel/regularizers/geometryMexC.mexw64 differ
diff --git a/kernel/regularizers/testRegularizers.m b/kernel/regularizers/testRegularizers.m
index ec27336..5d8590c 100644
--- a/kernel/regularizers/testRegularizers.m
+++ b/kernel/regularizers/testRegularizers.m
@@ -5,8 +5,9 @@
 % - https://github.com/C4IR and
 % - http://www.siam.org/books/fa06/
 %==============================================================================
-% This is a testing environment for the files in the folder kernel/data
-% 1. Based on data/contents, a list of required files is generated and it 
+% This is a testing environment for the files in the folder
+% kernel/regularizers
+% 1. Based on regularizers/contents.m, a list of required files is generated and it 
 %    is verified, that all files are present; additional files are listed.
 % 2. All c-files are compiled.
 % 3. All files are executed.
@@ -149,7 +150,7 @@
       'significant difference between matrix-based and matrix free code');
     
     % test dericatives
-    fprintf('test deivative of [%s]\n',regularizer);
+    fprintf('test derivative of [%s]\n',regularizer);
     
     fctn = @(Y) regularizer(Y,omega,m);
     checkDerivative(fctn,Y);
diff --git a/kernel/tools/FAIRcheckFiles.m b/kernel/tools/FAIRcheckFiles.m
index e806dbe..10edd80 100644
--- a/kernel/tools/FAIRcheckFiles.m
+++ b/kernel/tools/FAIRcheckFiles.m
@@ -60,7 +60,7 @@ function FAIRcheckFiles(caller)
 %------------------------------------------------------------------------------
 % main loop, run over all files
 %------------------------------------------------------------------------------
-
+mexall = mexext('all');
 for j=1:length(FAIRtestStatus.(caller))
   name  = FAIRtestStatus.(caller)(j).name;
   check = FAIRtestStatus.(caller)(j).check;
@@ -80,10 +80,10 @@ function FAIRcheckFiles(caller)
       case '.m',
         OK = 1;
         if strcmp(FAIRtestStatus.('FAIRrun'),'on'),
-          OK = FAIReval(FAIRtestStatus.(caller)(j).name);
+          OK = FAIReval(name);
         end;
-        if strcmp(FAIRtestStatus.('FAIRedit'),'on') || not(OK),
-          FAIRopen(FAIRtestStatus.(caller)(j).name);
+        if strcmp(FAIRtestStatus.('FAIRedit'),'on') || OK==0,
+          FAIRopen(name);
         end;
       case {'.cpp','.c'},
         if strcmp(FAIRtestStatus.('FAIRcompile'),'on'),
@@ -91,10 +91,10 @@ function FAIRcheckFiles(caller)
         else
           OK = 1;
         end;
-      case {'.h','.o',lower(['.',mexext])},
+      case {'.h','.o'},
         OK = 1;
 
-      case {'.mexa64'},
+      case strcat({'.'}, {mexall.ext}),
         OK = 3;
 
         
@@ -111,10 +111,10 @@ function FAIRcheckFiles(caller)
 J = find([FAIRtestStatus.(caller)(:).check] <= 0);
 
 if length(J)>0,
-  fprintf('none performimg files:\n');
+  fprintf('non-performing files:\n');
   for j=J
     fprintf('  - %4d-of-%4d %-30s\n',...
-      j,length(J),FAIRtestStatus.(caller)(j).name);
+      j,length(FAIRtestStatus.(caller)),FAIRtestStatus.(caller)(j).name);
   end;
 end;
 
@@ -148,7 +148,7 @@ function FAIRcheckFiles(caller)
   eval(sprintf('dbclear in %s',file))
   run(file);
   OK = 1;
-catch
+catch e
   fprintf('file does not run without errors\n');
   OK = -10;
 end;
diff --git a/kernel/tools/FAIRcheckFolder.m b/kernel/tools/FAIRcheckFolder.m
old mode 100644
new mode 100755
index 81ddaca..e7e713f
--- a/kernel/tools/FAIRcheckFolder.m
+++ b/kernel/tools/FAIRcheckFolder.m
@@ -95,9 +95,10 @@
 % 
 % if strcmp(FAIRignoreCompiles,'on')
 %   ignore = zeros(length(credit),1);
+%   mexall = mexext('all');
 %   for k=1:length(credit)
 %     [~,~,ext] = fileparts(credit{k});
-%     ignore(k) =  any(strcmp(ext,{'.o',['.',mexext]}));
+%     ignore(k) =  any(strcmp(ext,[{'.o'},strcat({'.'}, {mexall.ext})]));
 %   end;
 %   credit(find(ignore)) = [];    
 % end;
@@ -113,7 +114,7 @@
   % keyboard
 end;
 
-% merge debit and andons, sort by type
+% merge debit and addons, sort by type
 files = {debit{:},credit{:}};
 ext           = @(str) str(max(1,find(str=='.',1,'last')):end);
 extensions    = cellfun(ext,files','UniformOutput',0)';
@@ -133,7 +134,8 @@
 
 function [C,OK] = sortFiles(list)
 
-ext = {'.cpp','.c','.h','.o',['.',mexext],'.mexa64','.mat','.jpg','.m'};
+mexall = mexext('all');
+ext = [{'.cpp','.c','.h','.o','.mat','.jpg','.m'}, strcat({'.'}, {mexall.ext})];
 C = []; R = 1:length(list);
 for p=1:length(ext),
   K = find(strcmp(list,ext{p}));
@@ -142,6 +144,6 @@
 end;
 OK = isempty(R);
 for k=1:length(R)
-  fprintf(' - %d-of-%d, unknown extension [%s]\n',j,length(R),list{R(k)} )
+  fprintf(' - %d-of-%d, unknown extension [%s]\n',k,length(R),list{R(k)} )
 end;
 %==============================================================================
diff --git a/kernel/tools/FAIRerror.m b/kernel/tools/FAIRerror.m
new file mode 100755
index 0000000..6ddf8a9
--- /dev/null
+++ b/kernel/tools/FAIRerror.m
@@ -0,0 +1,18 @@
+function FAIRerror(err)
+
+if nargin == 0
+    FAIRerror('nice error');
+    return;
+end
+
+fprintf(2,'\n\n ----- FAIRerror.m \n');
+
+if ischar(err)
+    fprintf(2,'%s',err);
+elseif isa(err,'MException')
+    fprintf(2,'%s - %s',err.identifier,err.message);
+else
+    fprintf(2,'No clue, sry.');
+end
+
+fprintf(2,'\n ----- \n\n');
\ No newline at end of file
diff --git a/kernel/transformations/splineTransformation2D.m b/kernel/transformations/splineTransformation2D.m
index 6229c9a..0ecc17c 100644
--- a/kernel/transformations/splineTransformation2D.m
+++ b/kernel/transformations/splineTransformation2D.m
@@ -44,12 +44,12 @@
 
 if isempty(w) || (size(Q,1) ~= numel(x)) || (size(Q,2) ~= numel(w)),
   % it is assumed that x is a cell centered grid, extract xi1 and xi2
-  dim = size(omega,2)/2
-  n   = numel(x)/dim
+  dim = size(omega,2)/2;
+  n   = numel(x)/dim;
   if n == prod(m)
     q = m;
   elseif n == prod(m+1)
-    q = m+1
+    q = m+1;
   else
     error('can not handle this grid')
   end;
diff --git a/kernel/viewers/testViewer.m b/kernel/viewers/testViewer.m
index c039f3c..9f7f41c 100644
--- a/kernel/viewers/testViewer.m
+++ b/kernel/viewers/testViewer.m
@@ -5,7 +5,7 @@
 % - https://github.com/C4IR and
 % - http://www.siam.org/books/fa06/
 %==============================================================================
-% This is a testing environment for the files in the folder kernel/viewer
+% This is a testing environment for the files in the folder kernel/viewers
 % 1. Based on data/contents, a list of required files is generated and it 
 %    is verified, that all files are present; additional files are listed.
 % 2. All c-files are compiled.