From: Jos De_Roo <jos.deroo@agfa.com>

Date: Fri, 5 Dec 2003 18:55:20 +0100

To: "timbl" <timbl@w3.org>, "connolly" <connolly@w3.org>

Cc: www-archive+n3bugs@w3.org, "Piet Dewaele" <piet.dewaele@agfa.com>

Message-ID: <OF0799D5A9.0B336961-ONC1256DF3.006165E4-C1256DF3.006272AA@agfa.be>

Date: Fri, 5 Dec 2003 18:55:20 +0100

To: "timbl" <timbl@w3.org>, "connolly" <connolly@w3.org>

Cc: www-archive+n3bugs@w3.org, "Piet Dewaele" <piet.dewaele@agfa.com>

Message-ID: <OF0799D5A9.0B336961-ONC1256DF3.006165E4-C1256DF3.006272AA@agfa.be>

The different conclusions were found, but the bug is in euler :( I was completely mistaken by mixing up tanh and atan and forgot about tanh(x) = i.tan(x/i). Sorry for the confusion :) -- Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/ ----- Forwarded by Jos De_Roo/AMDUS/MOR/Agfa-NV/BE/BAYER on 2003-12-05 06:43 PM ----- Jos De_Roo To: timbl@w3.org@internet, connolly@w3.org@internet 2003-12-02 02:09 cc: www-archive+n3bugs@w3.org, Piet Dewaele/AMEGE/MOR/Agfa-NV/BE/BAYER@AGFA PM Subject: cwm's tanh builtin Tim, Dan, While doing some tests with angle measurements I found different conclusions with cwm than I found with euler. I simplified the case to a simpler one: ################################################### @prefix log: <http://www.w3.org/2000/10/swap/log#>. @prefix math: <http://www.w3.org/2000/10/swap/math#>. @prefix : <testP#>. :M :ratio 1. {:M :ratio ?R. ?R math:tanh ?A} => {:M :angle_rad ?A}. {:M :angle_rad ?A. ?A math:degrees ?D} => {:M :angle_deg ?D}. ############################################################# and cwm thought :M :angle_deg 43.636130838093536; :angle_rad 0.76159415595576485; :ratio 1 . but euler got :M :angle_deg [iw:Variable "_:X_2"; = 45.0]. I experimented a bit and got a likewise result with a change in cwm_trigo.py __cvsid__ = '$Id: cwm_trigo.py,v 1.10 2003/10/20 17:31:54 timbl Exp $' line 123 return tanh(numeric(subj_py)) ^^^^atan i.e. cwm then thought :M :angle_deg 45.0; :angle_rad 0.78539816339744828; :ratio 1 . This was with Python 2.2.1 - the is running quite well :) -- Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/Received on Friday, 5 December 2003 12:55:26 UTC

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