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From: SourceForge.net <noreply@so...>  20100403 20:38:46

Bugs item #2981631, was opened at 20100403 15:38 Message generated for change (Tracker Item Submitted) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2981631&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: Share Libraries Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Barton Willis (willisbl) Summary: abs_integrate bug Initial Comment: (%i3) load(abs_integrate)$ (%i4) integrate(min(x+1,1x,y+1,1y),y,1,1); first: empty argument. #0: abs_int_extra(q=x*signum(x)/4,x=y)(abs_integrate.mac line 215) #1: signum_int(q=x*signum(x)/4,x=y)(abs_integrate.mac line 136) #2: lambda([s],signum_int(s,x))(s=x*signum(x)/4)(abs_integrate.mac line 145)  an error. To debug this try: debugmode(true);  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2981631&group_id=4933 
From: SourceForge.net <noreply@so...>  20100403 11:33:43

Bugs item #2980551, was opened at 20100401 15:31 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2980551&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  Simplification Group: None >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Dieter Kaiser (crategus) Assigned to: Nobody/Anonymous (nobody) Summary: Inconsistent simplification of exp(x*%i*%pi) Initial Comment: Some simplifications of %especial are problematic, e.g. exp((2+x)^2*%pi*%i) > %e^(%i*%pi*(x+2)^24*%i*%pi) exp((2+x)^10*%pi*%i) > %e^(%i*%pi*(x+2)^101024*%i*%pi) The handling of expressions is inconsistent, e.g. the following is simplified exp((2+x)*%i*%pi) > exp(%i*%pi*x) but not the expanded form exp(2*%i*%pi%+%i*%pi*x) > e^(%i*%pi*x+2*%i*%pi) Furthermore, we have inconsistent simplifications of expressions which contain float or bigfloat values. The following shows some examples of a testfile to check the simplification of expressions like exp(x*%pi*%) and the desired results: ********************** Problem 5 *************** Input: exp(2*%i*%pi) Result: 1 ... Which was correct. ********************** Problem 6 *************** Input: exp((x+2)*%i*%pi) Result: %e^(%i*%pi*x) ... Which was correct. ********************** Problem 7 *************** Input: exp(x*%i*%pi+2*%i*%pi) Result: %e^(%i*%pi*x+2*%i*%pi) This differed from the expected result: exp(x*%i*%pi) ********************** Problem 8 *************** Input: log(exp((x+2)^2*%i*%pi)) Result: %i*%pi*(x+2)^24*%i*%pi This differed from the expected result: (x+2)^2*%i*%pi ********************** Problem 9 *************** Input: exp(2.0*%i*%pi) Result: %e^(2.0*%i*%pi) This differed from the expected result: 1.0 ********************** Problem 10 *************** Input: exp((x+2.0)*%i*%pi) Result: %e^(%i*%pi*x) This differed from the expected result: exp(1.0*x*%i*%pi) ********************** Problem 11 *************** Input: exp(x*%i*%pi+2.0*%i*%pi) Result: %e^(%i*%pi*x+2.0*%i*%pi) This differed from the expected result: exp(1.0*x*%i*%pi) ********************** Problem 12 *************** Input: log(exp((x+2.0)^2*%i*%pi)) Result: %i*%pi*(x+2.0)^24*%i*%pi This differed from the expected result: (x+2.0)^2*%i*%pi ********************** Problem 13 *************** Input: exp(2.0b0*%i*%pi) Result: %e^(2.0b0*%i*%pi) This differed from the expected result: 1.0b0 ********************** Problem 14 *************** Input: exp((x+2.0b0)*%i*%pi) Result: %e^(%i*%pi*x) This differed from the expected result: exp(1.0b0*x*%i*%pi) ********************** Problem 15 *************** Input: exp(x*%i*%pi+2.0b0*%i*%pi) Result: %e^(%i*%pi*x+2.0b0*%i*%pi) This differed from the expected result: exp(1.0b0*x*%i*%pi) ********************** Problem 16 *************** Input: log(exp((x+2.0b0)^2*%i*%pi)) Result: %i*%pi*(x+2.0b0)^24*%i*%pi This differed from the expected result: (x+2.0b0)^2*%i*%pi ********************** Problem 17 *************** Input: exp(3*%pi*%i/2) Result: %i ... Which was correct. ********************** Problem 18 *************** Input: exp(1.5*%pi*%i) Result: %e^(1.5*%i*%pi) This differed from the expected result: 1.0*%i ********************** Problem 19 *************** Input: exp(1.5b0*%pi*%i) Result: %e^(1.5b0*%i*%pi) This differed from the expected result: 1.0b0*%i ********************** Problem 20 *************** Input: exp((x+3/2)*%pi*%i) Result: %i*%e^(%i*%pi*x) ... Which was correct. ********************** Problem 21 *************** Input: exp((x+1.5)*%pi*%i) Result: %i*%e^(%i*%pi*x) This differed from the expected result: %i*exp(1.0*%i*%pi*x) ********************** Problem 22 *************** Input: exp((x+1.5b0)*%pi*%i) Result: %i*%e^(%i*%pi*x) This differed from the expected result: %i*exp(1.0b0*%i*%pi*x) Dieter Kaiser  >Comment By: Dieter Kaiser (crategus) Date: 20100403 13:33 Message: A more consistent handling of float and bigfloat numbers has been implemented in csimp.lisp revision 1.21 and 1.22 and simp.lisp revision 1.107. Closing this bug report as fixed. Dieter Kaiser  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2980551&group_id=4933 
From: SourceForge.net <noreply@so...>  20100403 00:00:11

Bugs item #2980662, was opened at 20100401 12:47 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2980662&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  Floating point Group: None >Status: Closed >Resolution: Invalid Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Incorrect calculation using 3.14 Initial Comment: One of the basic calculations is highly problematic: Input: a:3.14; b:1; Result a+b: 4.140000000000001 Error occurs only in the context of the number 3.14. (Maxima version: 5.20.1, Maxima build date: 15:50 2/19/2010.)  >Comment By: Barton Willis (willisbl) Date: 20100402 19:00 Message: This is how binary64 numbers work; see for example: http://www.validlab.com/goldberg/paper.pdf  Comment By: uhlst (uhlst) Date: 20100401 13:16 Message: Using Maxima 5.20.1 with CLISP 2.44.1 I obtain the following results which I think are correct (%i1) a:3.14; (%o1) 3.14 (%i2) b:1; (%o2) 1 (%i3) a+b; (%o3) 4.14 (%i4) a+b4.14; (%o4) 8.881784197001252E16 the error is in the range of the machine precision eps. See also the following octave session which gives the same result octave:1> 3.14 + 1 ans = 4.1400 octave:2> format long octave:3> 3.14 + 1 ans = 4.14000000000000 octave:4> 3.14 + 1  4.14 ans = 8.88178419700125e16 octave:5> eps ans = 2.22044604925031e16 I think you get the 4.140...01 because of the rounding of 8.88e16 to 1e15 which is displayed  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2980662&group_id=4933 