bug#20126: 24.3; emacs 24.3.1 calc curve fitting bug

bug#20126: 24.3; emacs 24.3.1 calc curve fitting bug

[Tobias Höppner]

starting calc-mode
M-x calc

entering a vector
v-x 5

and a second one

[5 7 9 11 13]

packing in one matrix
2 RET
v-p

so the stack look this way
1:  [ [ 1, 2, 3,  4,  5  ]
       [ 7, 9, 11, 13, 15 ] ]

now try to fit a curve

a-F 1 RET

Message: Model expression is too complex: a + b * x



In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
  of 2014-02-22 on king, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:	Ubuntu 12.04.5 LTS

Configured using:
  `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
  '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
  '--localstatedir=/var/lib' '--infodir=/usr/share/info'
  '--mandir=/usr/share/man' '--with-pop=yes'
 
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
  '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
  '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
  'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
  --param=ssp-buffer-size=4 -Wformat -Wformat-security
  -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions
  -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
   value of $LC_COLLATE: en_US.UTF-8
   value of $LC_CTYPE: en_US.UTF-8
   value of $LC_MESSAGES: en_US.UTF-8
   value of $LANG: en_US.UTF-8
   locale-coding-system: utf-8-unix
   default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
   tooltip-mode: t
   mouse-wheel-mode: t
   tool-bar-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent input:
<help-echo> M-x c a l c <return> v x 5 <return> [ 7
SPC 9 <return> 1 1 <return> 1 3 <return> 1 5 <return>
] 2 <return> v p a F 1 <return> = N <help-echo> <down-mouse-1>
<mouse-1> M-x r e p o r t - e m a <tab> <return>

Recent messages:
v-
Working...
Fit to model: (Press ? for help):
Preparing rule set FitRules...done
Compiling rule set FitRules...done
Model expression is too complex: a + b * x
Working...
Model expression is too complex: a + b * x
Working...
Model expression is too complex: a + b * x

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils calc-stuff calc-map calc-rules calc-rewr calc-prog
calc-arith calc-aent calcalg3 calc-incom calccomp calc-alg calc-vec
calc-ext calc-misc calc-menu easymenu calc calc-loaddefs calc-macs
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

bug#20126:

[Dima Kogan]

This works for me also, with an emacs built from git (Feb 2016).

bug#20126: 24.3; emacs 24.3.1 calc curve fitting bug

[Stefan Kangas]

Tobias Höppner <tobias.hoeppner@informatik.tu-chemnitz.de> writes:

> starting calc-mode
> M-x calc
>
> entering a vector
> v-x 5
>
> and a second one
>
> [5 7 9 11 13]
>
> packing in one matrix
> 2 RET
> v-p
>
> so the stack look this way
> 1:  [ [ 1, 2, 3,  4,  5  ]
>       [ 7, 9, 11, 13, 15 ] ]
>
> now try to fit a curve
>
> a-F 1 RET
>
> Message: Model expression is too complex: a + b * x

I can't reproduce this on current master, and neither could two separate
reviewers in 2015 and 2016.  I'm therefore going to assume that this has
been fixed and close this bug report.

If you're still seeing this on the latest version of Emacs, please
reopen the bug report.

Best regards,
Stefan Kangas