Re: [Bug-apl] Equals and not-equals operators for complex numbers yield wrong results.

[Juergen Sauermann]

Hi,

fixed in SVN version 99, thanks for reporting this.

/// Jürgen


On 01/19/2014 11:51 PM, Frederick H. Pitts wrote:
> Gentle people,
>
>         In GNU APL 1.0, evaluating
>
>         0J0 = 0J0
>
> yields 0.  Replacing the equals operator with the not-equal operator and
> re-evaluating yields 1.  Furthermore, evaluating
>
>         0J0 = 0
>
> yields 0.
>
>         I discovered the above anomalies while attempting to write a regression
> test for the encode operator.  When I attempted to compare the result of
> encoding 4 in binary (i.e., 1 0 0) with 1 0 0 and then reducing with
> logical and, I get 0.  That is because the two zeros in the result are
> actually complex zeros and fail to compare for equality with the real
> zeros in the expected answer.  Oddly enough, the leading 1 does compare
> correctly.  Maybe the complex 1 demotes to real 1 and then integer 1
> correctly while the complex zero does not.
>
>         If the above behavior of complex/complex and complex/real compares for
> equality/inequality is what is actually intended, the release notes and
> user documentation should emphasize the fact.
>
>         And if the above has been reported previously, please forgive my
> intrusion.
>
> Regards
>
> Fred Pitts
> Retired Chemical Engineer