Create a struct inside a cell array

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Sebastian Holmqvist 2012-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/42703-create-a-struct-inside-a-cell-array

I'm using struct2xml from FileExhange and it's quite picky on the format of the structure to export. Basically I loose information when exporting data arrays (they are converted to strings). Example;

x = 1:3;
s.child.Text = x;
xml = struct2xml(s)
xml = 
   <?xml version="1.0" encoding="utf-8"?>
   1 2 3

As you can see, the array of doubles has been converted into a string which makes it cumbersome for me to read the data back. I would like to have a format of;

<?xml version="1.0" encoding="utf-8"?>
   1
   2
   3

but here's my pickle. In order for that to happen, I have to have a cell array of child-objects with a struct('Text', Value) in each.

s.child.Text = num2cell(x);

won't work, as struct2xml ultimately expects a struct (with field Text) but only gets a cell.

s.child = struct('Text', num2cell(x));

won't work, as that generates three separate structs. Multiple structs must be in cells.

cellfun(@struct, 'Text', num2cell(x));

won't accept the field name 'Text' unfortunately.

Any brilliant ideas?

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Answer 1

Jan 2012-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/42703-create-a-struct-inside-a-cell-array#answer_52533

编辑：Jan 2012-7-4

在 MATLAB Online 中打开

I do not know struct2xml, but the author does. Did you try to contact him already?

Intuitively I'd try:

s.child(1).Text = 1;
s.child(2).Text = 2;
s.child(3).Text = 3;

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Sebastian Holmqvist 2012-7-4

Your 3rd line won't give me the correct structure, but I appreciate the pre-allocation part. I guess I'll accept it for what it is. I was looking for some form of "vectorization" but it seems cumbersome.

Thanks!

Jan 2012-7-4

编辑：Jan 2012-7-4

Are you sure? It looks like my code creates exactly the same s as yours. Anyway, vectorization is efficient, when the data can be represented in a vector like form. A loop is not necessarily slower, when you deal with nested structs and cells.

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