MATLAB: Execute code if m-file runs into error

errorexitMATLABmfilescripting error

I have tried finding the answer to this problem, but only got 'old' results which did not pose a solution. Maybe by now there is one.

I am controlling a combustion process using an m-file, which occasionally runs into errors (mostly scripting errors and typos). Having an error while the combustion is unstable, for example, is quite dangerous, so I want Matlab to execute a few lines of code whenever the m-file runs into an error. This is just simply closing the gas valve and turning the fan on.

Is there any solution for this? The problem is that most errors are scripting errors, which don't just give an error but also stop the mfile running…

Thanks!

Best Answer

use try and catch at all suspect instances. This will solve your case.

But when you call a blob a script, it should not have scripting errors or typos;)

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MATLAB: M-file function

Your function is calling itself without approaching any convergance or something that will allow it to end. Therefore it will run forever and eventually out of memory (hence the error). Try splitting it up into a script and a function as so:

Script:

 %creating window of plot from -5 to 50 using stepsize 0.25 for t x-axis
 %t should be on the x axis, v should be on the y axis
 k=0; 
for i= -5:.25:50
    k = k+1;
    t(k)=i;
    v(k)=vPieceWise(t(k));
end 
plot(t,v);
 
figure
plot(t,v);
hold on

Function:

%Part A: Mfile function to compute v as a function of t
function v = vPieceWise(t)
 if (t < 0)
        v = 0;
    elseif (0 <= t)&&(8<=16)
        v = -5*t+10*t.^2;
    elseif (8<=16)&&(t<=16)
        v = 624 - 3*t;
    elseif (t<=16)&&(t<=26)
        v = 12*(t-16).^2+36*t;
    elseif (26<t)
        v = 2136*exp(-0.1*(t-26));
 end

MATLAB: Running perl script from matlab

Your XML input file is not "well formed", so the parser fails. "Well formed" means that all tags are terminated, among some other things, but this is a more thorough definition.

Check out the location indicated with a text editor (which will let you find the position indicated very quickly) to see if there is something glaringly wrong -- for example an unmatched ">" or "<". A very quick check if you don't have an XML authoring tool is to try and open the file in a Web browser. If it's valid XML you will be able to read the contents of the file, if it's not, you will get an error. Keep working with the file in a text editor until it loads in the browser, and then you should be able to parse it.

Best Answer

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