can anybody give me a example showing how to avoid division by 0 by using try-catch?

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Lin LI 2011-10-7

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采纳的回答： Grzegorz Knor

can anybody give me a example showing how to avoid division by 0 by using try-catch? thank you very much!

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Jan 2011-10-7

TRY-CATCH does not *avoid* the division by zero. In opposite: The term "try" means, that MATLAB tries to calculate the division and calls the CATCH block, if an error occurs.

Lin LI 2011-10-7

thank you , Jan, I am trying to do some integration , what i mean is that when the denominator is 0 ,I want to replace the denominator with a another nonzero number, so that i can continue to do integration. can I use the try to detect division by 0 warning, then use the catch to replace the denominator. can you show me the code?

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Answer 1

Grzegorz Knor 2011-10-7

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Dividing by zero does not return an error in Matlab. So I suggest you to use if - else instead try - catch:

for k = -5:5
    if k~=0
        x = 1./k;
        disp(x)
    else
        disp('you try divide by zero!')
    end
end

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Lin LI 2011-10-7

thank you , Grzegorz and andrei, I am trying to do some integration , what i mean is that when the denominator is 0 ,I want to replace the denominator with a another nonzero number, so that i can continue to do integration. can I use the try to detect division by 0 warning, then use the catch to replace the denominator. can you show me the code?

Walter Roberson 2011-10-7

I do not remember the details at the moment, but I seem to recall that division by zero is noticed and reported via a warning or error (I do not remember which), except that that warning or error is turned off by default.

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Answer 2

Walter Roberson 2011-10-7

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Don't do that. Do like I recommended earlier: calculate the denominator and assign the result to a variable, and test the range of the variable, and take appropriate corrective action if it is smaller than you want.