MATLAB: DivideByZero warning does not show up when dividing by zero.

dividebyzero warning divide by zero

I am working with MATLAB 2011a, and I do not see the MATLAB:divideByZero warning appearing when I do divide by zero, though I set the divideByZero warning on with:

warning on MATLAB:divideByZero

I tried it with MATLAB 2009, and the warning appeared in this release. Unfortunately, I need to have it working on 2011a.

How can I get this warning to appear?

Best Answer

The following is in the Release Notes for R2009b. However, explicitly turning on the warning does not enable it for me, in R2011a. I don't see the warning on the screen, or using the lastwarn() function.

http://www.mathworks.com/help/releases/R2009b/pdf_doc/matlab/rn.pdf

Divide By Zero and Log Of Zero Warnings Off By Default

MATLAB no longer displays Divide by zero and Log of zero warnings unless you explicitly enable them with the following commands:

warning on MATLAB:divideByZero
warning on MATLAB:log:LogOfZero

This only affects the display of the warning message on the screen; the warning status is still updated as usual.

Related Solutions

MATLAB: Divide by Zero Warning

At some point matlab got rid of this warning so there's no way to turn it on with recent versions of Matlab.

If you need this warning for a particular function or script, you could write a simple conditional statement that throws a warning when the denominator is equal to zero.

Here's an example.

p = n/d; 
if any(d(:) == 0)
    warning('Divide by zero')
end

MATLAB: How to receive information on how to suppress warning messages to the MATLAB Command Window in MATLAB 7.0 (R14)

In MATLAB 7.0 (R14), the warning display is set to "off" by default. However, you can change this option by using the following command:

warning verbose

Likewise, you can choose the option to be "on" or "off" explicitly with the following lines of code:

warning verbose on
warning verbose off

To set the warning display to "on" by default, you can put the above command in your startup.m file.

Best Answer

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MATLAB: Divide by Zero Warning

MATLAB: How to receive information on how to suppress warning messages to the MATLAB Command Window in MATLAB 7.0 (R14)

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