Table.Prop​erties.Var​iableNames​" will not allow me to include parentheses () or brackets [ ] in my column heading

Its is not allowing special char

clear all;
close all;
clc;

%Constant Values
A=1;                   %VOLTS
b0=1;                  %DIMENSIONLESS
r=0.75;                %DIMENSIONLESS
xn=ones(1,41);         %Input Sequence as a matrix equal to the Unit-Step Sequence in VOLTS (always 1) 
n=[0:1:40];            %Value of "n" ranges from 0 to 40 and are in 1 unit increments
%Impulse response of a 2nd-Order Infinite Impulse Response (IIR) Filter
hn=b0*(-r).^n.*(n+1);  %Creates a matrix of values from h[0], h[1], h[2],...,h[n-1],[n]
%Cumulatively sums the values of h[n] which yields the Output Sequence "y[n]"
yn=cumsum(hn);
N=n(:);               %Transforms matrix of values of "n" into a single column
XN=xn(:);             %Transforms matrix of values of "xn" into a single column
HN=hn(:);             %Transforms matrix of values of "h[n]" into a single column
YN=yn(:);             %Transforms matrix of values of "y[n]" into a single column
T = table(N, XN, HN, YN) %Outputs a table with the values of "n," the input sequence "x[n],"
                         %the 2nd-Order (IIR) filter "h[n]," and the output sequence "y[n]."
%T.Properties.VariableNames = {'n' 'x[n] (V)' 'h[n]' 'y[n] (V)'}
 T.Properties.VariableNames{1} = 'X_n'
T.Properties.VariableNames {2}='Min%'
T.Properties.VariableNames{3} = '1.96\sigma %'
T.Properties.VariableNames{4} = '1M'

Table.Properties.VariableNames" will not allow me to include parentheses () or brackets [ ] in my column heading

Anybody can help

[Stephen23]

Neither parentheses nor square brackets are permitted in variable names:

https://www.mathworks.com/help/matlab/ref/table.html#mw_bf5821b9-f395-4fd1-8c87-376e0a360a48

https://www.mathworks.com/help/matlab/matlab_prog/variable-names.html

Answer 1

[Walter Roberson]

VariableNames for tables must be MATLAB variables. This is needed because using TABLENAME.VARIABLE is a fundamental access syntax for tables.

There is a VariableDescription property for tables, but it only shows up when you use summary()

[Walter Roberson]

Note: it is plausible that this will change in the future.

[Steven Lord]

The future is now. As of release R2019b, table variable names may contain spaces and other characters.

>> C = (-40:100).';
>> F = (9/5)*C+32;
>> T = table(C, F, 'VariableNames', {'degrees (C)', 'degrees (F)'});

>> head(T)
ans =
  8×2 table
    degrees (C)    degrees (F)
    ___________    ___________
        -40             -40   
        -39           -38.2   
        -38           -36.4   
        -37           -34.6   
        -36           -32.8   
        -35             -31   
        -34           -29.2   
        -33           -27.4   

>> T{T.('degrees (C)') == 0, 'degrees (F)'}
ans =
    32

>> T{T.('degrees (C)') == 100, 'degrees (F)'}
ans =
   212

[Walter Roberson]

Yup -- I just couldn't say that back then because NDA ;-)

[Steven Lord]

Ditto ;)