How do you get rid of the VariableNamingRule warning when you do want it set to modify ?

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Santiago Chazaro 2023-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/1984414-how-do-you-get-rid-of-the-variablenamingrule-warning-when-you-do-want-it-set-to-modify

评论： Peter Perkins 2023-7-17

Hi, I have the following code:

opts = detectImportOptions(fullfile(file_B_path, file_B_name)); % Detects import of table
opts = setvartype(opts, 'ID', 'string'); % Sets ID to string datatype
opts = setvartype(opts, 'RvCCompliance', 'string'); % Sets RvC Compliance to string datatype
---> opts.VariableNamingRule = 'modify'; 
file_B = readtable(fullfile(file_B_path, file_B_name),opts); % Imports table

and I keep getting the following warning:

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before 
creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.

I know that variablenamingrule is set to modify, in fact, I want it to be set to modify. Why wont adding the line with the pointer get rid of this messege ?

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Answer 1

dpb 2023-6-16

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在 MATLAB Online 中打开

It's annoying to be constantly nagged, agreed. But, setting it explicitly doesn't affect whether it is generated or not as you've discovered.

But, while a pain to have to do every time use readtable, it's relatively simple to fix...

opts = detectImportOptions(fullfile(file_B_path, file_B_name)); % Detects import of table
opts = setvartype(opts, 'ID', 'string');                        % Sets ID to string datatype
opts = setvartype(opts, 'RvCCompliance', 'string');             % Sets RvC Compliance to string datatype
w=warning('off','MATLAB:table:ModifiedAndSavedVarnames');       % turn off annoying warning, save state
file_B = readtable(fullfile(file_B_path, file_B_name),opts);    % Imports table
warning(w);                                                     % reset warning level

Since 'modify' is the default state for the name preservation property, it doesn't need to be set in the options struct and makes no difference if it is (as you've seen).