Inserting doubles into the field of a struct

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BA ，2022-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1807825-inserting-doubles-into-the-field-of-a-struct

评论： BA ，2022-9-19

Wondering if anyone knows how to insert a "double" into a struct. I was trying to use the following code to do it but I keep getting the error "Scalar structure required for this assignment."

Updating.GoodNews = Upda;

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Answer 1

Chunru 2022-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1807825-inserting-doubles-into-the-field-of-a-struct#answer_1056300

load(websave("Updating.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1129165/Updating.mat"))
load(websave("Upda.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1129170/Upda.mat"))
whos
  Name                        Size            Bytes  Class     Attributes

  Optimism_EMA_Updating      29x1              3312  struct              
  Upda                       28x31             6944  double              
  cmdout                      1x33               66  char                
% Optimism_EMA_Updating is an array of structure
% assignment should be done for struct element
Optimism_EMA_Updating(1).GoodNews = Upda;
Optimism_EMA_Updating(1)
ans = struct with fields:
       SubID: 21760059
    GoodNews: [28×31 double]

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BA 2022-9-19

Thank you!

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Answer 2

Image Analyst 2022-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1807825-inserting-doubles-into-the-field-of-a-struct#answer_1056305

It's because Updating is a structure array so you need to put Upda into a new structure in the array. This works, where I append Upda to the existing array:

% Load mat files into structures.
s1 = load('Updating.mat')
s2 = load("Upda.mat")
% Extract variables from the structures.
Optimism_EMA_Updating = s1.Optimism_EMA_Updating
Upda = s2.Upda
% Append Upda as a new structure at the end of the structure array
Optimism_EMA_Updating(end+1).SubID = Upda