[FieldTrip] remove trials after ft_preprocessing

[qi li]

I am new to fieldtrip. After I processed the data, I got
triggered_trials =

           hdr: [1x1 struct]
         label: {273x1 cell}
          time: {1x20 cell}
         trial: {1x20 cell}
       fsample: 600
    sampleinfo: [20x2 double]
          grad: [1x1 struct]
           cfg: [1x1 struct]
Now I want to remove a few trials with trial no 1 3 5 8. What command do I
need to remove the trials and keep the structure of triggered_trials
unchanged? Thanks!
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