How to make a table for a struct that contains elements with more than one number?

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John 2025-2-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2173703-how-to-make-a-table-for-a-struct-that-contains-elements-with-more-than-one-number

评论： Walter Roberson 2025-2-10

A struct is defined and it adds values as going: X.a, X.b, X.c. etc.most of them is a single value, but a few are arrays with multiple values, such as X.g(1), X.g(2), etc.

When convert them to table using:

thetable = array2table(X, 'RowNames', FileName, 'VariableNames', structNames);
fig = uifigure('Name', 'Variable');
uitable(fig, 'X', thetable);

It displays a very long horizontal table with correct display for those of single value elements. But for those array elements, it displays 2Xdouble, 3Xdouble, etc. not numbers.

The questions are:

(1) How to display those array element separately to view every value?

(2) How to rotate the table?

Thank you.

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Answer 1

Voss 2025-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/2173703-how-to-make-a-table-for-a-struct-that-contains-elements-with-more-than-one-number#answer_1559148

在 MATLAB Online 中打开

X = struct('a',1,'b',22,'c',1:3);
FileName = "SoMe/fIlE\NaMe";
thetable = struct2table(X, 'RowNames', FileName);
fig = uifigure('Name', 'Variable');
uitable(fig, 'Data', thetable);

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Voss 2025-2-10

在 MATLAB Online 中打开

X{1} = struct('a',1,'b',22,'c',[5 7 9]);

X{2} = struct('a',4,'b',99,'c',[12 56 76]);

That assigment will work if X either doesn't already exist or is an existing cell array (not some other type of variable).

You can also create X "from scratch":

X = { ...
    struct('a',1,'b',22,'c',[5 7 9]) ...
    struct('a',4,'b',99,'c',[12 56 76]) ...
    }
X = 1x2 cell array
    {1x1 struct}    {1x1 struct}

Now if all elements of X contain a scalar struct with the same fields, then you can make a struct array out of it:

Y = [X{:}]
Y = 1x2 struct array with fields:
    a
    b
    c

If not all elements of X contain a struct or the fields are different between different structs in X, then you cannot do this and some additonal work is required to represent X in a table (since any field can be present or not in any struct in X). Therefore, I'll assume you have a struct array.

I'll also assume you have a string array of file names, one per element of X:

FileNames = "SoMe/fIlE\NaMe"+" "+(1:numel(Y))
FileNames = 1x2 string array
    "SoMe/fIlE\NaMe 1"    "SoMe/fIlE\NaMe 2"

Then one way to make an appropriate table is as follows:

thetable = cell2table(cellfun(@mat2str,permute(struct2cell(Y),[1 3 2]),'UniformOutput',false), ...
    'RowNames',fieldnames(Y),'VariableNames',FileNames)
thetable = 3x2 table
         SoMe/fIlE\NaMe 1    SoMe/fIlE\NaMe 2
         ________________    ________________

    a      {'1'      }        {'4'         } 
    b      {'22'     }        {'99'        } 
    c      {'[5 7 9]'}        {'[12 56 76]'} 

John 2025-2-10

移动：Voss 2025-2-10

在 MATLAB Online 中打开

Thank you!

You truly are a MATLAB guru! I hope you can help again.

When I apply it to my script, please forgive me, the code to generate the data is quite long, so I can't show the entire script.

I displayed the final data which now is a 2 struct cell. fprintf class and size:

class of data: cell, size of data: [2 18]

display data showed:

data = 2×18 cell array

Columns 1 through 13
{2×1 double}    {2×1 double}    {2×1 double}    {[4.5676]}    {[3.1360e+04]}    {[1.1183e+04]}    {[0.2741]}    {[2.8262]}    {[0.0158]}    {[0.7682]}    {[0.9947]}    {[0.9987]}    {[2.0350]}
{2×1 double}    {2×1 double}    {2×1 double}    {[4.5676]}    {[2.1617e+04]}    {[1.1674e+04]}    {[0.9403]}    {[3.8473]}    {[0.0237]}    {[0.8084]}    {[0.9947]}    {[0.9988]}    {[2.0338]}
  Columns 14 through 18
{[2.5434e+05]}    {[5.8075e+11]}    {[7.8644]}    {[2.0091e+10]}    {[10.0886]}
{[2.5434e+05]}    {[3.1615e+11]}    {[7.6420]}    {[1.1234e+10]}    {[ 9.8517]}

Display data{1} or data{2} showed each is a 'struct' of above.

The error is below:

Error using horzcat
Dimensions of arrays being concatenated are not consistent.
Error in makeTable (line 49)
datastruct = [data{:}];
^^^^^^^

Voss 2025-2-10

There don't appear to be any structs in data, only numeric vectors (e.g., "2x1 double", 4.5676, etc.).

Walter Roberson 2025-2-10

What result are you expecting for combining a 2 x 1 double with a 1 x 1 double ?

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How to make a table for a struct that contains elements with more than one number?

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How to make a table for a struct that contains elements with more than one number?

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