added magnitude option

kernel/ClassStuff/@itaCoordinates/surf.m

@@ -41,7 +41,7 @@ function varargout = surf(this, varargin)
 narginchk(1,inf);
 
 defaultProperties = {'EdgeAlpha',0, 'FaceColor', 'interp'};
-sArgs        = struct('pos1_data','double', 'radius', [],defaultProperties{:},'parent',[]);
+sArgs        = struct('pos1_data','double', 'radius', [],'magnitude',0,defaultProperties{:},'parent',[]);
 if ~isempty(varargin)
     [data,sArgs] = ita_parse_arguments(sArgs,varargin); 
 end
@@ -49,6 +49,10 @@ end
 numArgIn = nargin;
 
 
+if sArgs.magnitude
+   data = abs(data); 
+end
+
 %% now set r and color according to the input variables
 
 % there is three options for the colorbar settings: