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array2table won't accept variable name input

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I am attempting to turn an array into a table before I output it into a file, and I am running into an error when I attempt to try and put variable names into my table.
data = randi(100,10,5);
headers = {'T','1','2','3','4'};
tabl = array2table(data,'VariableNames',headers);
Error using array2table (line 62)
'1' is not a valid variable name.
Error in TestCode (line 3)
tabl = array2table(data,'VariableNames',headers);
I don't understand why '1' is not a valid variable name. Can I not use numbers, even when they're a string? I have confirmed the class is 'char' for the actual contents of the headers cell, but it still doesn't seem to like it.

Risposta accettata

Jan il 24 Mar 2021
Which Matlab version are you using? In the current version 2021a I find:
doc table
% Variable names can have any Unicode® characters,
% including spaces and non-ASCII characters.
Your code run without problems.
In former Matlab versions the variables of tables needed to be valid Matlab symbols: < 64 characters, ASCII, no spaces, initial character cannot be an underscore or digit.
  1 Commento
Bob Thompson
Bob Thompson il 24 Mar 2021
I'm using 2016b, so it has to start with a letter, and can't contain spaces.

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Più risposte (1)

Sean de Wolski
Sean de Wolski il 24 Mar 2021
Modificato: Sean de Wolski il 24 Mar 2021
Support for invalid variable names was added recently so you're probably on an older release that required >>isvarname(varname) to be true.
You can
  1. upgrade
  2. call: matlab.lang.makeValidName to turn your names valie
  3. Change the names to valid yourself "One", "Two" would be valid...
  1 Commento
Bob Thompson
Bob Thompson il 24 Mar 2021
Unfortunately, I'm not capable of upgrading.
I'm also not sure if I am capable of modifying the validity of names, and would prefer to avoid that option.
So, in the end I did end up changing the names by adding an alphabetical character at the beginning of each number.

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