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2010-07-22T07:13:32.070
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2015-04-06T06:58:20.980
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2015-04-06T06:58:20.980
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Ok I got the answer from the author I post here: support for IEEE floating-point infinities is platform-dependent. The following Lisps work, at least on this system (MacOSX): SBCL <pre><code>R> (r "/" 1 0) .SB-EXT:DOUBLE-FLOAT-POSITIVE-INFINITY R> (r "log" 0) .SB-EXT:DOUBLE-FLOAT-NEGATIVE-INFINITY </code></pre> Allegro CL <pre><code>R> (r "/" 1 0) .EXCL:*INFINITY-DOUBLE* R> (r "log" 0) .EXCL:*NEGATIVE-INFINITY-DOUBLE* </code></pre> LispWorks <pre><code>R> (r "/" 1 0) +1D++0 #| +1D++0 is double-float plus-infinity R> (r "log" 0) -1D++0 #| -1D++0 is double-float minus-infinity </code></pre> CMUCL doesn't (X86:SIGFPE-HANDLER, no exceptions enabled), but I think this can be fixed (<a href="http://common-lisp.net/project/cmucl/doc/cmu-user/extensions.html#float-traps" rel="nofollow noreferrer">http://common-lisp.net/project/cmucl/doc/cmu-user/extensions.html#float-traps</a>). ECL is the last one that I tried, and it's apparently the one you use (I got the same <code>FLOATING-POINT-OVERFLOW</code> exception). It seems that it also allows to disable overflow checks using <code>SI:TRAP-FPE</code>, this might be what you need (the following example is taken from <a href="http://www.lispforum.com/viewtopic.php?f=2&t=386" rel="nofollow noreferrer">http://www.lispforum.com/viewtopic.php?f=2&t=386</a>): <pre><code>(let* ((bits (si::trap-fpe 'last nil))) (prog1 (/ 1.0 0.0) (si::trap-fpe bits t))) .SI:SINGLE-FLOAT-POSITIVE-INFINITY </code></pre> Also this works in general: <pre><code>(handler-case (r "/" 2 0) (floating-point-overflow () nil)) </code></pre>
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1. This table or related slice is empty.
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1. POPackage RCL and Inf
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1. PTAnswer
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1. USRainer Joswig
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1. USfrancogrex
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1. POPackage RCL and Inf
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1. COAlso this works in general: (handler-case (r "/" 2 0) (floating-point-overflow () nil))
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 USfrancogrex

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