GNU bug report logs - #12687
24.2.50; calc volume units conversion

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Edmund Kademan <ed <at> kademan.org>
Subject: bug#12687: closed (Re: bug#12687: 24.2.50; calc volume units
 conversion)
Date: Sat, 20 Oct 2012 04:20:02 +0000

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Your bug report

#12687: 24.2.50; calc volume units conversion

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 12687 <at> debbugs.gnu.org.

-- 
12687: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12687
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Jay Belanger <jay.p.belanger <at> gmail.com>
To: Edmund Kademan <ed <at> kademan.org>
Cc: jay.p.belanger <at> gmail.com, 12687-done <at> debbugs.gnu.org
Subject: Re: bug#12687: 24.2.50; calc volume units conversion
Date: Fri, 19 Oct 2012 23:18:00 -0500

> emacs -Q
> C-x **    ;start calc
> 'gal RET  ;enter 1 gallon
> uc        ;try to convert to new units
>
> At this point calc should prompt for new units, but it does not.

Oh; thanks for catching this!

> A workaround for me is to redefine the math-get-standard-units
> function:

That works for this case (but for the wrong reasons ... for example, if
you convert gallons to liters and then convert gallons again, it won't
offer liters as a default).  The problem was that `math-extract-units'
wasn't dealing with powers of units (and the standard units for volume
are m^3).  This has been fixed in bzr.

Thanks again,
Jay

[Message part 3 (message/rfc822, inline)]

From: Edmund Kademan <ed <at> kademan.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; calc volume units conversion
Date: Fri, 19 Oct 2012 18:25:39 -0400

emacs -Q
C-x **    ;start calc
'gal RET  ;enter 1 gallon
uc        ;try to convert to new units

At this point calc should prompt for new units, but it does not.

A workaround for me is to redefine the math-get-standard-units
function:

*** calc-units.el	2012-10-19 17:35:54.000000000 -0400
--- calc-units-changed.el	2012-10-19 18:14:30.000000000 -0400
***************
*** 383,390 ****
  
  (defun math-get-standard-units (expr)
    "Return the standard units in EXPR."
!   (math-simplify-units
!    (math-extract-units
      (math-to-standard-units expr nil))))
  
  (defun math-get-units (expr)
--- 383,390 ----
  
  (defun math-get-standard-units (expr)
    "Return the standard units in EXPR."
!   (math-extract-units
!    (math-simplify-units
      (math-to-standard-units expr nil))))
  
  (defun math-get-units (expr)


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