You can subscribe to this list here.
2002 
_{Jan}

_{Feb}

_{Mar}

_{Apr}

_{May}

_{Jun}
(67) 
_{Jul}
(61) 
_{Aug}
(49) 
_{Sep}
(43) 
_{Oct}
(59) 
_{Nov}
(24) 
_{Dec}
(18) 

2003 
_{Jan}
(34) 
_{Feb}
(35) 
_{Mar}
(72) 
_{Apr}
(42) 
_{May}
(46) 
_{Jun}
(15) 
_{Jul}
(64) 
_{Aug}
(62) 
_{Sep}
(22) 
_{Oct}
(41) 
_{Nov}
(57) 
_{Dec}
(56) 
2004 
_{Jan}
(48) 
_{Feb}
(47) 
_{Mar}
(33) 
_{Apr}
(39) 
_{May}
(6) 
_{Jun}
(17) 
_{Jul}
(19) 
_{Aug}
(10) 
_{Sep}
(14) 
_{Oct}
(74) 
_{Nov}
(80) 
_{Dec}
(22) 
2005 
_{Jan}
(43) 
_{Feb}
(33) 
_{Mar}
(52) 
_{Apr}
(74) 
_{May}
(32) 
_{Jun}
(58) 
_{Jul}
(18) 
_{Aug}
(41) 
_{Sep}
(71) 
_{Oct}
(28) 
_{Nov}
(65) 
_{Dec}
(68) 
2006 
_{Jan}
(54) 
_{Feb}
(37) 
_{Mar}
(82) 
_{Apr}
(211) 
_{May}
(69) 
_{Jun}
(75) 
_{Jul}
(279) 
_{Aug}
(139) 
_{Sep}
(135) 
_{Oct}
(58) 
_{Nov}
(81) 
_{Dec}
(78) 
2007 
_{Jan}
(141) 
_{Feb}
(134) 
_{Mar}
(65) 
_{Apr}
(49) 
_{May}
(61) 
_{Jun}
(90) 
_{Jul}
(72) 
_{Aug}
(53) 
_{Sep}
(86) 
_{Oct}
(61) 
_{Nov}
(62) 
_{Dec}
(101) 
2008 
_{Jan}
(100) 
_{Feb}
(66) 
_{Mar}
(76) 
_{Apr}
(95) 
_{May}
(77) 
_{Jun}
(93) 
_{Jul}
(103) 
_{Aug}
(76) 
_{Sep}
(42) 
_{Oct}
(55) 
_{Nov}
(44) 
_{Dec}
(75) 
2009 
_{Jan}
(103) 
_{Feb}
(105) 
_{Mar}
(121) 
_{Apr}
(59) 
_{May}
(103) 
_{Jun}
(82) 
_{Jul}
(67) 
_{Aug}
(76) 
_{Sep}
(85) 
_{Oct}
(75) 
_{Nov}
(181) 
_{Dec}
(133) 
2010 
_{Jan}
(107) 
_{Feb}
(116) 
_{Mar}
(145) 
_{Apr}
(89) 
_{May}
(138) 
_{Jun}
(85) 
_{Jul}
(82) 
_{Aug}
(111) 
_{Sep}
(70) 
_{Oct}
(83) 
_{Nov}
(60) 
_{Dec}
(16) 
2011 
_{Jan}
(61) 
_{Feb}
(16) 
_{Mar}
(52) 
_{Apr}
(41) 
_{May}
(34) 
_{Jun}
(41) 
_{Jul}
(57) 
_{Aug}
(73) 
_{Sep}
(21) 
_{Oct}
(45) 
_{Nov}
(50) 
_{Dec}
(28) 
2012 
_{Jan}
(70) 
_{Feb}
(36) 
_{Mar}
(71) 
_{Apr}
(29) 
_{May}
(48) 
_{Jun}
(61) 
_{Jul}
(44) 
_{Aug}
(54) 
_{Sep}
(20) 
_{Oct}
(28) 
_{Nov}
(41) 
_{Dec}
(137) 
2013 
_{Jan}
(62) 
_{Feb}
(55) 
_{Mar}
(31) 
_{Apr}
(23) 
_{May}
(54) 
_{Jun}
(54) 
_{Jul}
(90) 
_{Aug}
(46) 
_{Sep}
(38) 
_{Oct}
(60) 
_{Nov}
(92) 
_{Dec}
(17) 
2014 
_{Jan}
(62) 
_{Feb}
(35) 
_{Mar}
(72) 
_{Apr}
(30) 
_{May}
(97) 
_{Jun}
(81) 
_{Jul}
(63) 
_{Aug}
(64) 
_{Sep}
(28) 
_{Oct}
(45) 
_{Nov}
(48) 
_{Dec}
(109) 
2015 
_{Jan}
(106) 
_{Feb}
(36) 
_{Mar}
(65) 
_{Apr}
(63) 
_{May}
(95) 
_{Jun}
(56) 
_{Jul}
(48) 
_{Aug}
(55) 
_{Sep}
(100) 
_{Oct}
(57) 
_{Nov}
(33) 
_{Dec}
(46) 
2016 
_{Jan}
(76) 
_{Feb}
(53) 
_{Mar}
(88) 
_{Apr}
(79) 
_{May}
(62) 
_{Jun}
(65) 
_{Jul}
(37) 
_{Aug}
(23) 
_{Sep}
(108) 
_{Oct}
(68) 
_{Nov}
(66) 
_{Dec}
(47) 
2017 
_{Jan}
(55) 
_{Feb}
(11) 
_{Mar}
(30) 
_{Apr}
(12) 
_{May}

_{Jun}

_{Jul}

_{Aug}

_{Sep}

_{Oct}

_{Nov}

_{Dec}

S  M  T  W  T  F  S 




1
(2) 
2
(1) 
3
(2) 
4
(3) 
5
(2) 
6
(2) 
7
(1) 
8
(1) 
9

10
(4) 
11
(3) 
12
(13) 
13
(2) 
14
(5) 
15

16
(1) 
17
(1) 
18

19

20
(3) 
21
(3) 
22
(1) 
23
(4) 
24
(1) 
25
(1) 
26

27

28
(1) 
29

30
(2) 


From: SourceForge.net <noreply@so...>  20090405 23:15:07

Bugs item #2298099, was opened at 20081116 12:50 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2298099&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Lisp Core  Trigonometry Group: Includes proposed fix Status: Open Resolution: None Priority: 5 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: atan2 & logarc Initial Comment: When logarc is true, atan2 returns incorrect values in the left half plane: (%i5) logarc : true$ (%i6) e : atan2(y,x); (%o6) (%i*(log((%i*y)/x+1)log(1(%i*y)/x)))/2 Should be 3 %pi / 4, not  %pi / 4: (%i7) rectform(subst([y=1,x=1], e)); (%o7) %pi/4 Should be 3 %pi / 4, not  %pi / 4: (%i8) rectform(subst([y=1,x=1],e)); (%o8) %pi/4  >Comment By: Dieter Kaiser (crategus) Date: 20090406 01:14 Message: Remark: This topic was discussed already in the bug report SF [626721] "logarc of atan2 wrong". The function $logarc was fixed, but the simplifying function simpatan2 in comm2.lisp has still the problem. Therefore the flag logarc does not work. Dieter Kaiser  Comment By: Dieter Kaiser (crategus) Date: 20090405 21:27 Message: A more general definition of atan2(y,x) is:  %i * log((x+%i*y)/sqrt(x^2+y^2)) When we use this definition to transform atan2 for logarc:true, we will get the correct results. The changed code is ;($logarc (logarc '%atan (div y x))) ($logarc (mul 1 '$%i (simplify (list '(%log) (div (add x (mul '$%i y)) (power (add (mul x x) (mul y y)) (div 1 2))))))) The examples of this bug report would give the correct results. The testsuite has no problems: (%i13) logarc:true$ (%i16) atan2(x,y); (%o16) %i*log((y+%i*x)/sqrt(y^2+x^2)) (%i17) rectform(subst([y=1,x=1],atan2(y,x))); (%o17) 3*%pi/4 (%i18) rectform(subst([y=1,x=1],atan2(y,x))); (%o18) 3*%pi/4 Dieter Kaiser  Comment By: Raymond Toy (rtoy) Date: 20090302 16:50 Message: Perhaps this is really a bug in the logarc variable, or at least an inconsistency. atan2(y,x), logarc returns the expression you give above. But logarc(atan2(y,x)) > %i*log((x+%i*y)/sqrt(x^2+y^2)). This latter expression gives 3*%pi/4 for x=1, and y = 1. This is an example where log(x/y) is not equal to log(x)  log(y), I think.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2298099&group_id=4933 
From: SourceForge.net <noreply@so...>  20090405 19:27:17

Bugs item #2298099, was opened at 20081116 12:50 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2298099&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Lisp Core  Trigonometry >Group: Includes proposed fix Status: Open Resolution: None Priority: 5 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: atan2 & logarc Initial Comment: When logarc is true, atan2 returns incorrect values in the left half plane: (%i5) logarc : true$ (%i6) e : atan2(y,x); (%o6) (%i*(log((%i*y)/x+1)log(1(%i*y)/x)))/2 Should be 3 %pi / 4, not  %pi / 4: (%i7) rectform(subst([y=1,x=1], e)); (%o7) %pi/4 Should be 3 %pi / 4, not  %pi / 4: (%i8) rectform(subst([y=1,x=1],e)); (%o8) %pi/4  >Comment By: Dieter Kaiser (crategus) Date: 20090405 21:27 Message: A more general definition of atan2(y,x) is:  %i * log((x+%i*y)/sqrt(x^2+y^2)) When we use this definition to transform atan2 for logarc:true, we will get the correct results. The changed code is ;($logarc (logarc '%atan (div y x))) ($logarc (mul 1 '$%i (simplify (list '(%log) (div (add x (mul '$%i y)) (power (add (mul x x) (mul y y)) (div 1 2))))))) The examples of this bug report would give the correct results. The testsuite has no problems: (%i13) logarc:true$ (%i16) atan2(x,y); (%o16) %i*log((y+%i*x)/sqrt(y^2+x^2)) (%i17) rectform(subst([y=1,x=1],atan2(y,x))); (%o17) 3*%pi/4 (%i18) rectform(subst([y=1,x=1],atan2(y,x))); (%o18) 3*%pi/4 Dieter Kaiser  Comment By: Raymond Toy (rtoy) Date: 20090302 16:50 Message: Perhaps this is really a bug in the logarc variable, or at least an inconsistency. atan2(y,x), logarc returns the expression you give above. But logarc(atan2(y,x)) > %i*log((x+%i*y)/sqrt(x^2+y^2)). This latter expression gives 3*%pi/4 for x=1, and y = 1. This is an example where log(x/y) is not equal to log(x)  log(y), I think.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2298099&group_id=4933 