how to add element to a cell array struct without loop

Question

Xiaodi 2017-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/353394-how-to-add-element-to-a-cell-array-struct-without-loop

评论： Xiaodi 2017-8-20

Hi, I have a cell array, each of them is a structure, I want to add values in all arrays with field name myfield, how I do it without a loop?

for i = 1:10
   C{i}.myfield = 1;
end

I can not use

C{1:10}.myfield = 1;

because it has the error:Expected one output from a curly brace or dot indexing expression, but there were 10 results. Maybe is there another simple method?

Thanks forward

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Answer 1

Stephen23 2017-8-20

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编辑：Stephen23 2017-8-20

在 MATLAB Online 中打开

This would be trivially easy if you had stored your data in a non-scalar structure (instead of inefficiently in lots of separate structures in a cell array):

>> [S(1:10).data] = deal(1)
S = 
1x10 struct array with fields:
    data
>> S(1).data
ans =
     1
>> S(6).data
ans =
     1

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Stephen23 2017-8-20

编辑：Stephen23 2017-8-20

在 MATLAB Online 中打开

Unless there is a good reason why you need to keep the structures separate (e.g. different sizes or fields) I would simply convert to a non-scalar structure first, which would make all of your processing and code much simpler and more efficient. All you need is:

S = cell2mat(C)

You do not need to make your code ugly and inefficient because of someone else's bad data design.

PS: there is no way to access the structures in a cell array like that without a loop.

Xiaodi 2017-8-20