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newlispfanclub.alh.net • View topic - (abs ) crash with NaN

(abs ) crash with NaN

Q&A's, tips, howto's

(abs ) crash with NaN

Postby nigelbrown » Fri Dec 12, 2003 12:18 am

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Postby Lutz » Fri Dec 12, 2003 2:52 pm

this problem exists on Win32 but is fine on Linux/BSD where floating point functions on NaN return NaN.

In the upcoming 7.4.0 rc1 the Win32 version will behave the same way: All floating point operations on NaN return NaN. This is BTW also the same way Java is doing this. They have been very careful to offer a standard 'math' behaviour across platforms. The manual will also be changed accordingly.

NaN in an 'integer' context will still be treated like 0.

(+ 1 (sqrt -1)) => 0
(add 1 (sqrt -1)) => NaN

Lutz
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Postby nigelbrown » Tue Dec 16, 2003 9:46 pm

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Posts: 429
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Postby Lutz » Tue Dec 16, 2003 10:17 pm

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Postby Lutz » Wed Dec 17, 2003 12:36 am

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