store which iterations that the error took place

Hi everyone, I've been using try,catch and continue in my loop for any error. I was wondering is there any code that captures which iteration that error took place in the loop? so far I've put catch ME; disp(iter) to show me which iterations it is that the error took place but I can't capture them

Answer 1

[Adam Danz]

You could customize your own error message by basing it on the actual error message and appending the iteration number.

for i =1: 10
    try
        % [code that you don't trust :D]
    catch ME
        fprintf('%s Iteration #%d.\n', ME.message,i) %display error msg & iteration #
        % or         
        error('%s Iteration #%d.', ME.message,i) %this will break the code
    end
end

[JL]

Thanks. possible to strore them the error iter values in a matrix?

[Guillaume]

I'm a bit puzzled by your question, you can do whatever you want in a catch statement, including storing whatever you want in whichever variable you want:

errorloopindex = NaN;  %if still NaN, no error occured
for i = 1:Inf   %some loop
    try
        %some code
    catch ME
        errorloopindex = i;   %store loop index 
        warning('Error %s caught at index %d', Me.message, i)
    end
end

[Adam Danz]

badIterations = [];
for i =1: 10
    try
        % [code that you don't trust :D]
    catch ME
        badIterations(end+1) = i;
    end
end

[JL]

Thanks Adam!

Answer 2

[KALYAN ACHARJYA]

l=1;
error_iter=[];
for i=1:iter
% do operation
if error  %error condition
error_iter(l)=iter
l=l+1;
end
end
error_iter

[JL]

Thanks but It can't seem to work. I want to store each iterations value into a maxtrix