Doug's MATLAB Video Tutorials

February 3rd, 2009

Debugging session

 
clear
num = [1 1 1 1 1 1 1];
den = [1 2 3 0 5 6 7];
for i = 1: numel(den)
    if den(i) == 0
        a = 1
    else
        a(i) = num(i)/den(i)
    end
end
plot(a,'o-')
The above code does not behave as expected. The values in the middle of the vector are zeroed out. This debugging session figures out why this happens.
Find the files here.

By Doug Hull

20:53 UTC | Posted in Format: Video, Level: Basic | Permalink | 3 Comments »

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3 Responses to “Debugging session”

  1. Dennis replied on February 4th, 2009 at 10:46 UTC :

    The published code is actually the fixed version.

  2. Christos Saragiotis replied on February 4th, 2009 at 11:11 UTC :

    Nice example, point taken.

    However, the description of the video is misleading. It says “the above code does not behave as expected”, while the posted code is the corrected one.

    Regards

  3. dhull replied on February 4th, 2009 at 15:18 UTC :

    D’oh!

    Problem “unsolved”. First time I have purposefully put a bug back into my code.

    -Thanks,
    Doug

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