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From: AES on 19 Dec 2009 06:27
CellChangeTimes seems to be a new field that's been added, or at least
shows up, when you apply Show Expression to a cell.

For me at least, and the way I use Mathematica, it doesn't seem to be
anything I'll ever want to use or know about, and after a while it adds
an immense amount of distracting clutter to the results of Show
Expression (and presumably takes up a bit of unnecessary file space in
each notebook).

Any easy way to turn this capability off or eliminate it (at the deepest
and most permanent and most global level that is reasonably possible)?
-- or at least to suppress the display?

Any potential harmful effects to doing this, that may not be immediately
evident?

From: Peter Breitfeld on 20 Dec 2009 06:51

To switch CellCangeTimes off, go to Preferences/Advanced and
uncheck "Enable notebook history tracking"

AES wrote:

> CellChangeTimes seems to be a new field that's been added, or at least
> shows up, when you apply Show Expression to a cell.
>
> For me at least, and the way I use Mathematica, it doesn't seem to be
> anything I'll ever want to use or know about, and after a while it adds
> an immense amount of distracting clutter to the results of Show
> Expression (and presumably takes up a bit of unnecessary file space in
> each notebook).
>
> Any easy way to turn this capability off or eliminate it (at the deepest
> and most permanent and most global level that is reasonably possible)?
> -- or at least to suppress the display?
>
> Any potential harmful effects to doing this, that may not be immediately
> evident?
>

--
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de

From: Murray Eisenberg on 20 Dec 2009 06:52
As of Version 6, in fact, by default all cells now get a CellChangeTimes
option.

If you don't want CellChangeTimes at all, you can try to use the Options
Inspector setting TrackCellChangeTimes->False. But I think that will
apply only to cells newly created after the change. Or you could make
that a global setting, applicable to all notebooks. But beware: who
knows to what uses that option might be put by Mathematica. (The docs
don't seem to say.)



AES wrote:
> CellChangeTimes seems to be a new field that's been added, or at least
> shows up, when you apply Show Expression to a cell.
>
> For me at least, and the way I use Mathematica, it doesn't seem to be
> anything I'll ever want to use or know about, and after a while it adds
> an immense amount of distracting clutter to the results of Show
> Expression (and presumably takes up a bit of unnecessary file space in
> each notebook).
>
> Any easy way to turn this capability off or eliminate it (at the deepest
> and most permanent and most global level that is reasonably possible)?
> -- or at least to suppress the display?
>
> Any potential harmful effects to doing this, that may not be immediately
> evident?
>

--
Murray Eisenberg murray(a)math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305

From: adamg on 20 Dec 2009 06:53
NotebookPut[Notebook[{}, System`TrackCellChangeTimes -> False]]

will create a notebook with this cell version tracking feature disabled.
Or you can add this notebook level option to a style sheet you frequently
use.

Thanks,
-Adam

PS: CellChangeTimes can be viewed for an entire notebook by choosing
Cell>NotebookHistory from the Mathematica menus.

> CellChangeTimes seems to be a new field that's been added, or at least
> shows up, when you apply Show Expression to a cell.
>
> For me at least, and the way I use Mathematica, it doesn't seem to be
> anything I'll ever want to use or know about, and after a while it adds
> an immense amount of distracting clutter to the results of Show
> Expression (and presumably takes up a bit of unnecessary file space in
> each notebook).
>
> Any easy way to turn this capability off or eliminate it (at the deepest
> and most permanent and most global level that is reasonably possible)?
> -- or at least to suppress the display?
>
> Any potential harmful effects to doing this, that may not be immediately
> evident?
>



From: Alexander Elkins on 20 Dec 2009 06:54
CellChangeTimes came along with version 6 and supports the Notebook History
dialog launched from the Cell menu.

>From the Edit menu click on Preferences...
Select the Advanced tab in the Preferences dialog.
Under "Notebook History" un-check the "Enable notebook history tracking"
item.

This does not remove the CellChangeTimes settings already present in any
notebooks you have already edited.
The Option Inspector may the best way to remove those.

I am not aware of any harmful effects.

"AES" <siegman(a)stanford.edu> wrote in message
news:hgidat$o2q$1(a)smc.vnet.net...
> CellChangeTimes seems to be a new field that's been added, or at least
> shows up, when you apply Show Expression to a cell.
>
> For me at least, and the way I use Mathematica, it doesn't seem to be
> anything I'll ever want to use or know about, and after a while it adds
> an immense amount of distracting clutter to the results of Show
> Expression (and presumably takes up a bit of unnecessary file space in
> each notebook).
>
> Any easy way to turn this capability off or eliminate it (at the deepest
> and most permanent and most global level that is reasonably possible)?
> -- or at least to suppress the display?
>
> Any potential harmful effects to doing this, that may not be immediately
> evident?



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