cmucl-ticket December 2013

cmucl-ticket@common-lisp.net

1 participants
3 discussions

[cmucl] #90: (atanh -2)?
by cmucl 24 Dec '13

24 Dec '13

#90: (atanh -2)? --------------------+------------------------------------------------------- Reporter: rtoy | Owner: somebody Type: defect | Status: new Priority: major | Milestone: Component: Core | Version: 2013-12 Keywords: | --------------------+------------------------------------------------------- CMUCL 20e says {{{(atanh -2)}}} is {{{#C(-0.54930615 -1.5707964)}}}. This is consistent with what the CLHS says about {{{atanh}}} for {{{x < -1}}} being continuous with Quadrant III because {{{(atanh #c(-2.0 -0.0))}}} is the same. However, from the definition {{{ atanh(z) = 1/2*(log(1+z) - log(1-z)) }}} we have {{{ atanh(-2) = 1/2*(log(-1) - log(3)) = 1/2*(i*pi - log(3)) = -log(3)/2 + i*pi/2 }}} That is, the imaginary part should be positive. This would be consistent with the rule that atanh is continuous with Quadrant II. -- Ticket URL: <http://trac.common-lisp.net/cmucl/ticket/90> cmucl <http://common-lisp.net/project/cmucl> Cmucl is a high-performance, free Common Lisp implementation.

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Re: [cmucl] #88: enough-namestring
by cmucl 13 Dec '13

13 Dec '13

#88: enough-namestring --------------------+------------------------------------------------------- Reporter: heller | Owner: somebody Type: defect | Status: new Priority: major | Milestone: Component: Core | Version: 20e Keywords: | --------------------+------------------------------------------------------- Comment(by rtoy): This is my expectation too, but comments in the code for unparse-unix- enough says that you can't represent a relative directory relative to an absolute directory, which is what we have here. The comment doesn't explain why, so it must have been obvious at that time. More thinking required. -- Ticket URL: <http://trac.common-lisp.net/cmucl/ticket/88#comment:1> cmucl <http://common-lisp.net/project/cmucl> Cmucl is a high-performance, free Common Lisp implementation.

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[cmucl] #89: Follow C99 for the value of the special functions at exception arguments
by cmucl 12 Dec '13

12 Dec '13

#89: Follow C99 for the value of the special functions at exception arguments --------------------+------------------------------------------------------- Reporter: rtoy | Owner: somebody Type: defect | Status: new Priority: minor | Milestone: Component: Core | Version: 20e Keywords: | --------------------+------------------------------------------------------- The CLHS doesn't say anything for value of the special functions for exceptional arguments like infinity (signed) or NaN. Since CMUCL supports IEEE-754, we should follow the C99 specification when it does not conflict with the CLHS. -- Ticket URL: <http://trac.common-lisp.net/cmucl/ticket/89> cmucl <http://common-lisp.net/project/cmucl> Cmucl is a high-performance, free Common Lisp implementation.

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cmucl-ticket December 2013