Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.
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I really don't know what is the reason for this error. PLease help!
theta_dd(i)= (kP*r(i) +kD*r_dot(i) -(m*g*l+kP)*sin(theta(i)) -kD*theta_dot(i))/M;
2 Comments
Walter Roberson
on 24 May 2021
The cause of this kind of problem is having an invisible character such as a zero-width space, or having accidentally used "smart-quotes" instead of regular quotes.
Answers (5)
James Browne
on 10 Apr 2020
Edited: James Browne
on 10 Apr 2020
It is impossible to debug your one line of code because I can't run it on my end due to undefined variables. However, if you copied and pasted that line of code into MATLAB, it is likely that there is some text character(s) in the line that you copied which matlab does not recognize.
If you did copy and paste the code, try typing it in by hand instead. Otherwise you will need to post the whole code before anyone can really help you.
3 Comments
Walter Roberson
on 24 May 2021
Please attach the file that is having the problem, instead of pasting in the text.
Walter Roberson
on 10 Apr 2020
theta_dd(i)= (kP*r(i) +kD*r_dot(i) -(m*g*l+kP)*sin(theta(i)) -kD*theta_dot(i))/M;
Right after the semi-colon you have char(8203) which us U+200b which is "zero width space".
Put your cursor on the semi-colon and press shift and right arrow several times until your cursor is positioned on the next line. That should highlight several characters. Type in ; and then return. This process should get rid of the zero-width space.
0 Comments
Zeel Dhorajiya
on 28 Jun 2021
Edited: Walter Roberson
on 8 Sep 2021
A={0.1/2+0.6/3+0.4/4+0.3/5+0.8/6} B={0.5/2+0.8/3+0.4/4+0.6/5+0.4/6} u=input(‘A’); v=input(‘B’);
↑ Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
Please help me out
1 Comment
Walter Roberson
on 28 Jun 2021
You used ʼ (right single quotation mark) instead of ' (vertical single quotation mark)
Hem Ananth
on 8 Sep 2021
Edited: Walter Roberson
on 8 Sep 2021
%Program for linear convolution
%to get the input sequence
n1=input('enter the length of input sequence');
n2=input('enter the length of impulse sequence');
x=input('enter the input sequence');
h=input('enter the impulse sequence');
%convolution operation
y=conv(x,h);
%to plot the signal
subplot(3,1,1);
stem(x);
ylabel('amplitude');
xlabel('n1....>');
title('input sequence')
subplot(3,1,2);
stem(h);
ylabel('amplitude');
xlabel('n2....>');
title('impulse signal')
subplot(3,1,3);
stem(y);
ylabel('amplitude');
xlabel('n3');
disp('the resultant signal is');y
4 Comments
Stephen23
on 14 Sep 2022
Edited: Stephen23
on 14 Sep 2022
@Scott: the problem with your code is already explained here: https://www.mathworks.com/matlabcentral/answers/516793-invalid-text-character-check-for-unsupported-symbol-invisible-character-or-pasting-of-non-ascii-c#comment_1608535
Pyetra
on 14 Jun 2024
Error: Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII
characters.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1716066/image.png)
Alguém pode me ajudar?
1 Comment
DGM
on 15 Jun 2024
The error message tells you exactly what the problem is and which character to fix. Fix it.
If it's the dash character, replace it with a regular 0x002D hyphen-minus.
Nobody can be certain of which type of dash character that is since you posted a screenshot. Likewise, nobody can know if there are other invalid or invisible characters hidden in your code.
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