Limitations for table variable name

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Andrey Kazak
Andrey Kazak 2015-10-22
评论： Steven Lord 2021-2-9
Hello, dear community!
I try to name table variable with non-Latin character, for example Cyrillic:
>> a = table(zq, 'VariableNames', cellstr('я'));
Error using matlab.internal.tableUtils.makeValidName (line 36)
'я' is not a valid variable name.
Error in setVarNames (line 48)
[newnames,wasMadeValid] = matlab.internal.tableUtils.makeValidName(newnames,exceptionMode); % will warn if mods are made
Error in table (line 305)
t = setVarNames(t,vnames); % error if invalid, duplicate, or empty
If I do the same, but with variable named using Latin characters, then everything works fine. What could cause this error? Is this normal behavior?
Thank you.

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采纳的回答

Walter Roberson
Walter Roberson 2015-10-22
Normal. The names have the same restrictions as matlab variable names. Latin letter to start, continue with digits or underscore or Latin letters
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Andrey Kazak
Andrey Kazak 2015-10-28
Thank you, Walter. I made this in the following way:
  1. Created a matrix with the data and added top row of NaN
  2. xlswrite the matrix to a new XLSX file
  3. Created cell array of text headers, which is basically a row of text cells
  4. xlswrite the cell array to the same XLSX file
In the result I get with excel spreadsheet with header line and data.
In summary it seems not very convenient that MATLAB table column names are limited to MATLAB variable naming convention.
Walter Roberson
Walter Roberson 2015-10-28
If using xlswrite is acceptable, then use num2cell() to convert the numeric matrix to a cell array, add the headers to the top of that, and xlswrite() the whole thing out.

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更多回答（1 个）

Vy Le
Vy Le 2021-2-9
Hi, why I write it and they said 'inifity norm of number c' is not a valid table variable name
Thank you.
names = {'inifity norm of condition number c','infinity norm of the residual r1'};
table(c,r1,'VariableNames',names)
  1 个评论
Steven Lord
Steven Lord 2021-2-9
Ran in:
Prior to release R2019b table variable names were required to be valid MATLAB identifiers. In particular, that meant no spaces. That limitation was removed in release R2019b.
v = (1:5).';
A = table(v, v.^2, v.^3, 'VariableNames', ["v", "v squared", "v^3"])
A = 5x3 table
v v squared v^3 _ _________ ___ 1 1 1 2 4 8 3 9 27 4 16 64 5 25 125

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