tvector

 function t=tvector(dt)

 get relative time vector from data set.  converts the utc time of dt
 to units of type

 Inputs:
  dt - data timestamp
  type - 'min'
         'sec'
         'hour'

 example:
  t=tvector(d.array.frame.utc,'min')

0001 function t=tvector(dt,type)
0002 
0003 % function t=tvector(dt)
0004 %
0005 % get relative time vector from data set.  converts the utc time of dt
0006 % to units of type
0007 %
0008 % Inputs:
0009 %  dt - data timestamp
0010 %  type - 'min'
0011 %         'sec'
0012 %         'hour'
0013 %
0014 % example:
0015 %  t=tvector(d.array.frame.utc,'min')
0016 
0017 % make case insensitive
0018 type=lower(type);
0019 
0020 switch type
0021   case 'min'
0022     conv=24*60;
0023     
0024   case 'sec'
0025     conv=24*60*60;
0026     
0027   case 'hour'
0028     conv=24;
0029     
0030   otherwise
0031     t=[];
0032     disp('Unrecognized type input')
0033     return
0034 end
0035 
0036 t=dt-dt(1);
0037 t=t*conv;
0038 
0039 
0040