Create a table inside a structure

Question

Camilo Jurado Paez 2021-3-9

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评论： Camilo Jurado Paez 2021-3-12

I want to create a table inside a structure but I haven't been able to do so with my code

f = struct ('SectionName',{},'SectionID',{},'Measurements',...
    table ('MeasName',{},'DateTimeStart',{},'TimeDuration',{},...
    'Vehicle',{},'Spped',{},'Direction',{},'Lane',{},'VehPosition',{},...
    'Segment',{},'DataLabels',cell ({}),'DataWeighting',cell ({}),...
    'DataUnits',cell ({}),'TimeRaw_sec',[],'DataRaw',[]));

Thank you so much if anyone might help

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Answer 1

Steven Lord 2021-3-9

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This is not the correct way to create a table array with the specified variable names. The struct function accepts field names and field values as name-value pairs but table does not accept alternating variable names and variable values.

%{
T = table ('MeasName',{},'DateTimeStart',{},'TimeDuration',{},...
    'Vehicle',{},'Spped',{},'Direction',{},'Lane',{},'VehPosition',{},...
    'Segment',{},'DataLabels',cell ({}),'DataWeighting',cell ({}),...
    'DataUnits',cell ({}),'TimeRaw_sec',[],'DataRaw',[]);
%}

You want to specify the 'VariableNames' option to construct this table, and I would additionally specify the 'Size' and 'VariableTypes' options as well. I'm only going to create three variables, but you could create more.

T = table('Size', [2 3], ...
    'VariableTypes', {'cell', 'string', 'double'}, ...
    'VariableNames', ["C", "S", "D"])
T = 2x3 table
         C              S        D
    ____________    _________    _

    {0×0 double}    <missing>    0
    {0×0 double}    <missing>    0
T{2, "S"} = "abracadabra"
T = 2x3 table
         C                S          D
    ____________    _____________    _

    {0×0 double}    <missing>        0
    {0×0 double}    "abracadabra"    0

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Camilo Jurado Paez 2021-3-12

Thank you so much! was really helpful

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Answer 2

Jan 2021-3-9

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编辑：Jan 2021-3-9

在 MATLAB Online 中打开

Remember that struct('a', {}) creates an empty struct array. Then inserting a table should fail.

What is the purpose ofg cell({})? This is an empty cell as {} also.

The problem of your code is the error message:

Error using table:
Invalid parameter name: MeasName

This code creates the same message:

table('MeasName', {})

Based on the code, which does not run, I cannot guess, what you want to achieve. The problem is, that you cannot create a table with this command. It does not matter, that you try to do this inside a struct.

Explain, what you want to get as result.