add columne name to structure in matlab

main.m
        Here's an example:

        ```
        myStruct = struct('field1', [1 2 3], 'field2', [4 5 6])

        myStruct = 

        struct with fields:

            field1: [1 2 3]
            field2: [4 5 6]

        myStruct = setfield(myStruct, 'field1', 'columnNames', {'col1', 'col2', 'col3'})

        myStruct = 

        struct with fields:

            field1: [3x1 double]
                     columnNames: {'col1'  'col2'  'col3'}
            field2: [3x1 double]
        ```

        In the above code, we first define a structure `myStruct` with two fields `field1` and `field2`. We then use the `setfield` function to add a new field called `columnNames` to the `field1` field. The `columnNames` field is an array of strings that specify the column names for the values in `field1`.
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