How can i change struct size

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Catarina 2023-1-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1895925-how-can-i-change-struct-size

评论： Catarina 2023-1-17

Hi, I currently have one struct variable that includes another structure with dimensions 1x64, that itself contains three different fields (X,Y,Z). Each one of these fields has 64 numbers (hence, three columns with 64 lines each). However, I want to eliminate lines 49 to 64 because I only need the first 48 lines for each field. Overall what I pretend is to resize this 1x64 structure to a 1x48 one.

How can I do this? The only solution i found was to replace their value by "[]" which is not quite what im looking for.

Thank you in advance!

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Stephen23 2023-1-17

Save your data in a MAT file and upload it here by clicking the paperclip button.

Catarina 2023-1-17

here it is. its the "locations" structure i want to resize

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Answer 1

Stephen23 2023-1-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1895925-how-can-i-change-struct-size#answer_1150730

移动：Stephen23 2023-1-17

在 MATLAB Online 中打开

sample_data.mat

S = load('sample_data.mat')
S = struct with fields:
    ECOG: [1×1 struct]
E = S.ECOG
E = struct with fields:
         name: 'ECoG-Seizure-64-Channels'
         type: 'ECOG'
       nbchan: 64
       points: 2000
        srate: 400
    labeltype: ''
       labels: {1×64 cell}
    locations: [1×64 struct]
         data: [64×2000 double]
         unit: 'mv'
        start: 1
          end: 1
    dispchans: 1
          bad: [57 58 59 60 61]
         vidx: [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 62 63 64]
          min: -22.1477
          max: 22.1602
         size: [8 8]
E.locations
ans = 1×64 struct array with fields:
    X
    Y
    Z
E.locations(49:end) = [] % remove those structure elements
E = struct with fields:
         name: 'ECoG-Seizure-64-Channels'
         type: 'ECOG'
       nbchan: 64
       points: 2000
        srate: 400
    labeltype: ''
       labels: {1×64 cell}
    locations: [1×48 struct]
         data: [64×2000 double]
         unit: 'mv'
        start: 1
          end: 1
    dispchans: 1
          bad: [57 58 59 60 61]
         vidx: [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 62 63 64]
          min: -22.1477
          max: 22.1602
         size: [8 8]
E.locations
ans = 1×48 struct array with fields:
    X
    Y
    Z