Matlab's 'VariableNames' not accepting mix of numerical & non-numerical entries

Suppose we have a 1x3 table:

A=table(1,2,3);

whose header names should contain a mix of numericals and non-numericals:

A.Properties.VariableNames={'from 1st-5th' 'from 6th-10th' ...
    'from 11th-15th'};

This generates the following error:

'from 1st-5th' is not a valid variable name.

What I read through (and tried) already: sprintf function, whereas the formatSpec part was rather confusing. Furthermore I read about eval and would like to know whether this is helpful in my context.

[Stephen23]

"I read about eval and would like to know whether this is helpful in my context"

eval is almost never helpful in any context:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[Jorge Mario Guerra González]

It does not accept it because it has spaces and not because it has alphanumeric characters.

It will allow this, for example:

 A.Properties.VariableNames={'from_1st_5th' 'from_6th_10th' 'from_11th_15th'}

[Walter Roberson]

Right. https://www.mathworks.com/help/matlab/ref/table.html#input_argument_namevalue_VariableNames

"The variable names that you assign must be valid MATLAB® variable names"

[John]

thanks a lot, this work-around solution does its job for now.