function[objs] =  setLabel(objs, pattern)

%% define possible coding styles of markers
if (~ischar(pattern))
    error('Pattern must be character array')
end

%% check for existing patterns
for o = 1:length(objs)
        
    obj = objs(o);
    
    for l = 1:length(obj.label_patterns)
        
        if strcmp(obj.label_patterns{l}, pattern)
            display('Label already specified.');
            return;
        end
        
    end
    
    if isempty(obj.label_patterns)
        obj.label_patterns{1} = pattern;
    else
        if iscell(obj.label_patterns);
            for i = 1:length(obj.label_patterns)
                obj.label_patterns{i} = obj.label_patterns{i};
            end
            obj.label_patterns{i+1} = pattern;
        end
    end
    
    objs(o) = obj;
    
end