function classify(action)

if ~exist('action','var')
    action='no action';
end

    switch(action)
    case 'clear'
        evalin('base','clear map lm SPM classList dataTimeLine decodeTable labelTimeLine svmopts trialProtocol voxelList xTimeEnd xTimeStart xTimeWindow');
      
    case 'decode'
    


        display('loading SPM.mat');
        SubjectID = 'JZ006';
%         SubjectID = 'AI020';
%         SubjectID = 'HG027';
        spm = load(fullfile('D:\Analyze\Choice\24pilot',SubjectID,'results\SPM.mat'));

        display('done.');




        map = SubjectRoiMapping;

        voxelList  = [...
                      getCoordinate(map,SubjectID,'SPL l')+[0,0,0];...
                          getCoordinate(map,SubjectID,'SPL l')+[1,0,0];...
                          getCoordinate(map,SubjectID,'SPL l')+[-1,0,0];...
                          getCoordinate(map,SubjectID,'SPL l')+[0,1,0];...
                          getCoordinate(map,SubjectID,'SPL l')+[0,-1,0];...
                          getCoordinate(map,SubjectID,'SPL l')+[0,0,1];...
                          getCoordinate(map,SubjectID,'SPL l')+[0,0,-1];...
                      getCoordinate(map,SubjectID,'SPL r')+[0,0,0];...
                          getCoordinate(map,SubjectID,'SPL r')+[1,0,0];...
                          getCoordinate(map,SubjectID,'SPL r')+[-1,0,0];...
                          getCoordinate(map,SubjectID,'SPL r')+[0,1,0];...
                          getCoordinate(map,SubjectID,'SPL r')+[0,-1,0];...
                          getCoordinate(map,SubjectID,'SPL r')+[0,0,1];...
                          getCoordinate(map,SubjectID,'SPL r')+[0,0,-1];...
                      getCoordinate(map,SubjectID,'M1 r')+[0,0,0];...
                      getCoordinate(map,SubjectID,'M1 l')+[0,0,0];...
                      ];
        
        
        params = struct;
        params.nClasses = 2;

        assignin('base','params',params);
        %% calculate
        display('calculating cross-validation performance time-shift');
        calculateParams  = struct;
        
        calculateParams.des             = spm.SPM;
        calculateParams.frameShiftStart = -20;
        calculateParams.frameShiftEnd   = 15;
        calculateParams.decodeDuration  = 1;
        calculateParams.svmargs         = '-t 0 -s 0 -v 6';
        calculateParams.sessionList     = 1:3;
        calculateParams.voxelList       = voxelList;
        calculateParams.classList       = {'<','>'};
        calculateParams.labelMap        = LabelMap({'<','>','<+<','>+>','<+>','>+<'},{-2,-1,1,2,3,4});
        calculateParams.psthStart       = -25;
        calculateParams.psthEnd         = 20;
        calculateParams.baselineStart   = -22;
        calculateParams.baselineEnd     = -20;
        calculateParams.eventList       = [9,11,13; 10,12,14];
        
        assignin('base','calculateParams',calculateParams);
        
%         [decodeTable rawTimeCourse] = calculateDecodePerformance(spm,params.frameShiftStart,params.frameShiftEnd,params.xTimeWindow,params.svmopts,1:4,params.sessionList,params.voxelList,params.classList,params.labelMap,params.normalize);
        decode = calculateDecodePerformance(calculateParams);
        display(sprintf('Min CrossVal Accuracy: %g%% \t Max CrossVal Accuracy: %g%%',decode.minPerformance,decode.maxPerformance));
        
        assignin('base','decode',decode);

        display('Finished calculations.');
        display('Plotting.');

        plotParams = struct;
        plotParams.psthStart = calculateParams.psthStart;
        plotParams.psthEnd   = calculateParams.psthEnd;
        plotParams.nClasses  = length(calculateParams.classList);
        plotParams.frameShiftStart   = calculateParams.frameShiftStart;
        plotParams.frameShiftEnd     = calculateParams.frameShiftEnd;
        plotParams.decodePerformance = decode.decodePerformance;
        plotParams.rawTimeCourse     = decode.rawTimeCourse;
        plotParams.SubjectID         = SubjectID;
        
        assignin('base','plotParams',plotParams);
%         plotDecodePerformance(params.psthStart,params.psthEnd,params.nClasses,decode.decodeTable,params.frameShiftStart,params.frameShiftEnd,decode.rawTimeCourse);
        plotDecodePerformance(plotParams);

        case 'gen'
            center = '[-39 -33 67]';
            sessionList = '1:3';
            conditionList = '1:2';
            radius = 3;
            normalize = 1;

            cmd=sprintf(...
                '[label data] = generateDataMatrix(generateVoxelList(%s,%d), generateTrialProtocol(%s,%s),%d);',...
                center,radius,sessionList,conditionList,normalize);

            %     assignin('base','label',label);
            %     assignin('base','data',data);

    case 'norm'
        cmd = ['for i=1:size(data,2)'...
            'data(:,i)=data(:,i)/std(data(:,i));'...
        'end;'];
        
    case 'xtrain'
        svmargs = '-t 0'; %linear kernel
        svmargs = [svmargs '-v 4'];
        
        cmd=sprintf('model = svmtrain(label,data,''%s'')',svmargs);
        
    case 'train'
        svmargs = '-t 0'; %linear kernel
%         svmargs = [svmargs '-v 4'];
        
        cmd=sprintf('model = svmtrain(label,data,%s)',svmargs);
       
    case 'pred'
        cmd = '[predicted_label, accuracy, decision_values] = svmpredict(label, data, model);';
        
    otherwise
        display('give action command: clear load gen (norm) xtrain train pred');
    end
    
    if exist('cmd','var') 
        evalin('base',cmd);
    end

end