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Topic: fprintf output: What does -0 mean?
Replies: 6   Last Post: Jan 27, 2014 11:17 AM

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Curious

Posts: 2,006
Registered: 12/6/04
Re: fprintf output: What does -0 mean?
Posted: Jan 24, 2014 11:57 AM
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paul.domaskis@gmail.com wrote in message <88ea4802-02a1-42c8-a2d3-616cd7bba2e7@googlegroups.com>...
> I get a negative zero when printing a set of coefficients of lasso regression:
>

> >> format longg
> >> fprintf('%e\n',B(:,86))

> 0.000000e+00
> -0.000000e+00
> -0.000000e+00
> -1.367172e-01
> 0.000000e+00
> -6.460915e-02
> -1.078923e-10
>
> I can't provide simple code to do duplicate. A simply cut/paste of the above text to assign into a variable x does not yield the same fprintf results.
>
> What would cause the negative zero? How should it be interpretted?


It's probably just a VERY small negative number that you don't have enough significant digits to see.



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