Subject: bug#12687: closed (Re: bug#12687: 24.2.50; calc volume units conversion)

From: [email-masked] (GNU bug Tracking System)
Date: Sat, 20 Oct 2012 04:20:02 +0000

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 [email-masked].

-- 
12687: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12687
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#12687: 24.2.50; calc volume units conversion
From: Jay Belanger <[email-masked]>
To: Edmund Kademan <[email-masked]>
Cc: [email-masked], [email-masked]
Date: Fri, 19 Oct 2012 23:18:00 -0500
List-Id: <debbugs-submit.debbugs.gnu.org>

> 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

Subject: 24.2.50; calc volume units conversion
From: Edmund Kademan <[email-masked]>
To: [email-masked]
Date: Fri, 19 Oct 2012 18:25:39 -0400
List-Id: <debbugs-submit.debbugs.gnu.org>

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)

In GNU Emacs 24.2.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-10-19 on dl
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