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From: Albert Retey on 20 Dec 2009 06:54
AES schrieb:
> 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?

Edit -> Preferences, then in the Tab "Advanced" uncheck "Enable notebook
history tracking".

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

don't know

From: John Fultz on 20 Dec 2009 06:55
To prevent CellChangeTimes from being added anymore, go to the Option Inspector,
find the option TrackCellChangeTimes, and set it to False at the global scope.

To clear the information in an existing notebook, open the notebook and choose
Cell->Notebook History, then click the Clear History button.

Sincerely,

John Fultz
jfultz(a)wolfram.com
User Interface Group
Wolfram Research, Inc.


On Sat, 19 Dec 2009 06:27:35 -0500 (EST), 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?



From: David Reiss on 20 Dec 2009 06:56

Go to preferences? Advanced and uncheck "Enable Notebook History
Tracking"

The effect will be that an application that makes use of this won't
work unless it turns it on automatically...

--David

On Dec 19, 6:27 am, AES <sieg...(a)stanford.edu> 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?


From: magma on 20 Dec 2009 06:56
On Dec 19, 12:27 pm, AES <sieg...(a)stanford.edu> 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?

I think I saw a way to suppress time logging, but I leave that to
somebody else more knowledgeable in the matter.
I am more interested in knowing why you seem to be using Show
Expression so often that this feature bothers you? I personally use it
veeery rarely. Last time a few hours ago to answer a post here
relating to the special characters palette. I think I used it several
months ago the prior time.
Show Expression has a very complex output and IMO should only be used
by "hackers" and not regular Mathematica users. going so low level is not too
time efficient for regular users. If one wants to discover something
very special, it is faster to ask here in MathGroup.
If you want to see how things work internally (up to a certain level),
FullForm should be enough for regular Mathematica users (that is anybody who
is not a computer scientist).
So: why do you use Show Expression so often to be bothered by
CellChangeTimes ?

From: David Park on 21 Dec 2009 03:31
While it may be true that regular Mathematica users won't generally have to
look much at the underlying cell expression, there are a number of cases
where it is worthwhile. I think these rise a little above the "hacking"
level.

Underlying cell expressions are useful when you want to control the "look
and feel" of a notebook, but not so much for "doing mathematics". The most
common case is when you want to change options for cells. A case of this is
adding ShowGroupOpener -> True to various section headers.

Another useful place to work with the cell expressions is in designing style
sheets. Cell characteristics are almost all controlled by options and it
just seems to me to be more convenient to see them all listed in one place
instead of working from the Format menu.

Another useful place is in working with Workbench/DocuTools. The whole thing
is a little esoteric and one can get a better idea of what is going on by
looking at the underlying expressions in various linking constructs.
Sometimes you can copy existing cells and then edit the underlying
expression to obtain what you want.



David Park
djmpark(a)comcast.net
http://home.comcast.net/~djmpark/



From: magma [mailto:maderri2(a)gmail.com]

I am more interested in knowing why you seem to be using Show
Expression so often that this feature bothers you? I personally use it
veeery rarely. Last time a few hours ago to answer a post here
relating to the special characters palette. I think I used it several
months ago the prior time.
Show Expression has a very complex output and IMO should only be used
by "hackers" and not regular Mathematica users. going so low level is not
too
time efficient for regular users. If one wants to discover something
very special, it is faster to ask here in MathGroup.
If you want to see how things work internally (up to a certain level),
FullForm should be enough for regular Mathematica users (that is anybody who
is not a computer scientist).
So: why do you use Show Expression so often to be bothered by
CellChangeTimes ?



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