Bug #58319 for Math-Symbolic: Math-symbolic-derivative quotient rule

Thu Jun 10 17:37:35 2010 jimbo.yates [...] googlemail.com - Ticket created

Subject:	Math-symbolic-derivative quotient rule
Date:	Thu, 10 Jun 2010 22:37:25 +0100
To:	bug-Math-Symbolic [...] rt.cpan.org
From:	James W T Yates <jimbo.yates [...] googlemail.com>

Hi I've been using your Math-symbolic module and found a bug with quotients. For example: use Math::Symbolic qw/:all/; my $test=parse_from_string('2/x'); my $derived = $test->new('partial_derivative', $test, 'x'); $derived = $derived->apply_derivatives()->simplify(); print "$derived\n"; returns 4 If instead I use my $test=parse_from_string('c/x'); Undefined operands not supported by Math::Symbolic::Operator objects. at C:/Perl /site/lib/Math/Symbolic/Derivative.pm line 323 Please advise regards James

Fri Jun 11 03:58:05 2010 smueller [...] cpan.org - Correspondence added

Thank you for this bug report. The bug you describe is quite embarrassing. It's from a refactoring/optimization of the quotient rule code from a while back. I had added a couple of special cases that allowed early simplification of the resulting formula. I failed to get them right. A fixed release (0.604) will be released within the hour. Best regards, Steffen

Fri Jun 11 03:58:06 2010 The RT System itself - Status changed from 'new' to 'open'

Fri Jun 11 03:58:06 2010 smueller [...] cpan.org - Status changed from 'open' to 'resolved'

Sun Jun 13 11:20:10 2010 jimbo.yates [...] googlemail.com - Correspondence added

Subject:	Re: [rt.cpan.org #58319] Math-symbolic-derivative quotient rule
Date:	Sun, 13 Jun 2010 16:19:56 +0100
To:	bug-Math-Symbolic [...] rt.cpan.org
From:	James W T Yates <jimbo.yates [...] googlemail.com>

Hi Steffen Thanks for the quick response. Regards James On 11 June 2010 08:58, Steffen Mueller via RT <bug-Math-Symbolic@rt.cpan.org Show quoted text

> wrote:

Show quoted text

> <URL: https://rt.cpan.org/Ticket/Display.html?id=58319 > > > Thank you for this bug report. > > The bug you describe is quite embarrassing. It's from a > refactoring/optimization of the quotient rule code from a while back. I > had added a couple of special cases that allowed early simplification of > the resulting formula. I failed to get them right. > > A fixed release (0.604) will be released within the hour. > > Best regards, > Steffen >

Sun Jun 13 11:20:15 2010 The RT System itself - Status changed from 'resolved' to 'open'

Fri Dec 31 09:20:00 2010 smueller [...] cpan.org - Status changed from 'open' to 'resolved'

Fri Dec 31 09:20:00 2010 smueller [...] cpan.org - Fixed in 0.604 added