Problem with try/catch

Hi all,

I am experiencing a problem with the try/catch function. When I run the below script:

x=1:1:10;

for i=1:length(x)

try

if (x(i)==5)

disp('Success');

end

catch

disp('Dot index error');

continue

end

end

I am only getting a single output corresponding to the part when x(i)==5. Its not displaying the "Dot index error" for other values. I am not sure where I am doing wrong.

I looked into this similar post - https://www.mathworks.com/matlabcentral/answers/108074-try-catch-problems-with-matlab-2013 but that didnt have any follow up answers.

Thank you your help.

[Stephen23]

"Its not displaying the "Dot index error" for other values."

I don't see any reason why it should: nothing in your code would obviously throw an error.

"I am not sure where I am doing wrong."

You are not doing anything wrong: nothing wrong means no error, which means no catch execution.

If no error occurs in your code, what error do you expect try to detect?

[Mahith Madhana Kumar]

Oh yea. That makes sense. I was thinking the catch statement would be executed just like the else part of an if statement - my wrong. Thank you.

Answer 1

[KALYAN ACHARJYA]

Have you read the document of try catch Doc fucntion?

If any statement in a try block generates an error, program control goes immediately to the catch block, which contains your error handling statements.

x=5;
try
 if x==5
 kkdisp('Success');% Error undefined fucntion kkdisp
 end
catch
 disp('Dot index error');
end

What are you trying to do?

[Mahith Madhana Kumar]

Yes, I did. In the above code of mine I am expecting an output like this:

Dot index error

Dot index error

Dot index error

Dot index error

Success

Dot index error

Dot index error

Dot index error

Dot index error

Dot index error

But I am only seeing the single success as my output and not the others.

[KALYAN ACHARJYA]

x=1:1:10;
for i=1:length(x)
   if x(i)==5
       disp('Success');
   else
      disp('Dot index error');
   end
end

[Mahith Madhana Kumar]

Can we achieve the same output using try/catch function?

[KALYAN ACHARJYA]

It can be done anyway, its all about "Jugaad", is there any sense? The purpose of the function "Execute statements and catch resulting errors" (Error Handiling)

x=1:10;
for i=1:length(x)
try
 if x(i)~=5 
 % Any Error syantax
 HelloErrorHere
 disp('Success');
 else 
 disp('Success');  
 end
catch
 disp('Dot index error');
end
end  

Result:

Dot index error
Dot index error
Dot index error
Dot index error
Success
Dot index error
Dot index error
Dot index error
Dot index error
Dot index error
>> 

Answer 2

[Mahith Madhana Kumar]

Thank you for the help.