"T.Propert​ies.Variab​leNames" will not allow me to include parentheses () or brackets [ ] in my column heading

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James Long
James Long 2017-4-18
评论： James Long 2017-4-18
"T.Properties.VariableUnits" and "T.Properties.VariableDescriptions" also do not work to fix this issue. does anyone have a work around for this?
Here is my actual code:
%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{2} = 'x[n] (V)'

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Aniruddha Katre
Aniruddha Katre 2017-4-18
You get this error message because 'x[n] (V)' is not a valid MATLAB variable name. The columns in a table are actually MATLAB variables, so the column header must be a valid variable name. There are 3 rules for a valid variable name that need to be followed:
  1. Can only have letters, number and underscores in a variable name. Nothing else is allowed.
  2. Variable names have to start with a letter.
  3. Variable names can be up to 63 characters long.
'x[n] (V)' -- starts with a letter but has special characters such as brackets, specs and parenthesis in it which makes it an invalid variable name.
If you replace that with:
T.Properties.VariableNames{2} = 'x_n_V'
or something along those lines, that will work.
  1 个评论
James Long
James Long 2017-4-18
Aniruddha, thank you. I ended up exporting the data to an excel spreadsheet and there were no more issues. I appreciate the information on the constraints of Variable Names..will definitely assist in the future!

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