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Re: Default path for opening files

  • To: mathgroup at
  • Subject: [mg127026] Re: Default path for opening files
  • From: awnl <awnl at>
  • Date: Mon, 25 Jun 2012 04:01:21 -0400 (EDT)
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  • References: <jruonq$fgs$>


> Whenever I tried to open a file from my Mathematica directory (with
> rather deep structure), I have to start with "~/Documents/" (I am
> using Mac). I searched the help and I found that this directory is
> coded in the variable "$UserDocumentsDirectory". OK. So I tried to set
> this variable to the root of my Mathematica directory, but I found it
> protected. Then I setup my local "init.m" file. I unprotect it, set
> it, and protect it, in the init.m file. (This is another story though.
> I searched the web for half a day and I do not see any example or
> instruction, official or by other users, on how people can compose
> their own init.m file.) However, nothing is changed.

There are ways to change some of these "fixed" pathes with environment 
variables or arguments to the executable before you start mathematica. I 
don't know whether $UserDocumentsDirectory is amongst them, but don't 
think so. But I don't think this is what you need. Why don't you just 
use the full file path? You can define:

myRootDirectory = "/path/to/my/data"

and then use something like:


> When my data files grow in number, I decided that I should use the
> "FileNameSetter" interface in my NB to pick the file on the fly. That
> way I do not have to modify the code ( filename=xxxx ...., blablabla )
> for each datafile.

that seems reasonable...

> However, I found the same problem. In the
> "FileNameSetter" function, there is not an option to set the default
> starting path. (Or I am just too stupid to use electronic
> documentation so that I do not find the solution?) Everything starts
> with "~/Documents", although since the second time the directory tree
> will be expanded like what I saw the previous time (this is the case
> in Mac. I did not try under Windows or Linux).
> Is there any smarter way to do this?  Look forward to your helpful
> comments.

If you want FileNameSetter to start in a certain directory, give it that 
directory as a first argument. If you want a preselected filename, give 
a full path name and the dialog will open in the directory where that 
file lives (provided the directory does exist). Seems pretty 
straightforward to me, although it admittedly isn't very clear from the 
documentation. So this:

FileNameSetter[FileNameJoin[{$HomeDirectory, "Desktop"}]]

will start the file browseron your desktop, something like this:

filename = "/path/to/my/data/*.m"
FileNameSetter[Dynamic[filename], "Open"]

will open the file browser in /path/to/my/data and use a filter for .m 
files but have no "reasonable" filename selected. There are additionaly 
possibilities to further refine the filter settings, which you can get 
from the documentation.

I know this works for Windows and Linux and have also used this on a 
Mac, but honestly don't exactly remember what the file open dialog will 
actually show, but I would be very surprised if that wouldn't do 
something reasonable on a Mac.



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