How to change a portion of cell array?

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Mirthand 2021-3-31

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评论： Star Strider 2021-3-31

I have a large data set where I've put trials into a cell array. So each cell contains 1 trial and within that cell trial{1,1} there is specific information about the trial. The first column in trial{1,1} is time.

How do you access the first column for each cell?

In the end, I want to change the first column to have time start from 0. So I plan on doing time = time-1

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Star Strider 2021-3-31

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Guessing as to what the structure is, try this:

trial{1} = {(1:10).', rand(10,1), 'Information'};
FirstColumn = trial{1}{:,1}
SecondColumn = trial{1}{:,2}
ThirdElement = trial{1}{3}

producing (in this random run):

FirstColumn =
     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
SecondColumn =
      0.76396
       0.8182
      0.10022
      0.17812
      0.35963
     0.056705
      0.52189
      0.33585
      0.17567
      0.20895
ThirdElement =
    'Information'