When I save a .m file in a folder, MATLAB autosaves a .asv file in the same folder.
I opened this file and I found that it contains my code from the beginning, ignoring what I have deleted.
What is the use of this file?
What's the risk if I delete that file?
A .asv file is just what you said, an "AutoSave" file. It's just there so that you don't lose all your code if your computer crashes/shutdown. You can delete it whenever you want.
If you find them annoying you can go to File/Preferences/-->"Editor/Debugger" --> Autosave and turn it off.
Related
Every time I simulate in Dymola, a number of "useless" (for me) files are created in the working directory - i.e. dsfinal.txt, dsin.txt, dslog.txt, dsmodel.c, dymosim.exe. I find it annoying as it messes up my directory.
Is there a way to select only the desired output files to be kept after the simulations, without the need of manually deleting the undesired ones?
Those are temporary, but necessary files for Dymola. As far as I know there is no option to delete them automatically. Of course you could script that, but I don't see a real point to it and those files are used by some functionality - e.g. dsfinal.txt is used when as simulation is continued.
Some notes: Those files are created in the working directory - which should contain temporary files only. The working directory can be set via the GUI using File -> Options -> Settings:
A rather common problem is, that there is a Open and a Load function in Dymola:
As the description states, Load does not influence the working directory, whereas Open sets it to the directory from which a file is opened. The latter is also true for opening files e.g. via a double-click from the explorer. So usually it is better to go with Load.
My advice would be to separate the directories in which models/packages are stored and the working directory. This way the working directories content can be fully deleted basically anytime...
I tried to move multiple files into a folder, but there was a mistake in my matlab code that I didn't create the folder. Now all the files were moved to a single file which cannot be opened or edited. How to recover these files?
Example of the mistake:
a=strcat('C:\Users\foldername'); % name and directory of the folder
fname=a;
% mkdir(fname); % so this command wasn't executed...
movefile('file1',fname);
movefile('file2',fname);
So now file1 and file2 were merged in file 'fname', instead of in the folder named 'fname'. How to get file1 and file2 back?
Thanks in advance!
Unfortunately, the odds may be stacked against you getting back any of the files, except for the last one. The reason why is because movefile doesn't append to an existing destination file, it overwrites it. The following will give you back your last file (by simply renaming fname):
movefile(fname, 'file2');
If you're lucky, your operating system will have options for you to restore previous versions of your files/folders. Your best bet may be to check and see if the folder containing your original files has any previous versions you can open/restore to get previous versions of 'file1' and 'file2'. For example, on my Windows machine I can right click on my default MATLAB folder, select "Properties", then select the "Previous Versions" tab, and I see this:
You can see there are a few versions I could open and copy files from if I've inadvertently deleted or overwritten anything recently. Good luck!
Sometimes when I create .cpp or .sh files, for example, a.cpp, I see another file created and named #a.cpp#, I'm using ubuntu, what is that file?
According to http://www.gnu.org/software/emacs/manual/html_node/elisp/Auto_002dSaving.html, this is the notation how emacs handles its autosave files.
After closing and saving the file, it should dissapear.
Today I stumbled upon this thread:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/112560
The question is basically how to make Matlab read your startup.m file regardless of where
you start your matlab session.
One of the solutions offered was:
One solution would be to ask the system administrator to add a few lines
to "matlabrc.m" that adds some pre-determined folder in the user's home
directory to the MATLAB path (say, ~/.matlabstart). Then each user can
have their own "startup.m" file inside this folder.
What I ended up doing in my system (OS X) was to add a startup.m file in:
/Applications/MATLAB_R2011a.app/toolbox/local/
In this startup.m file I added:
if exist([getenv('HOME') '/.matlabrc/startup.m'])
run([getenv('HOME') '/.matlabrc/startup.m']);
end
That way users have the option of creating the hidden folder ~/.matlabrc and inside it they can put the file startup.m. In this startup file they can tell matlab what to execute whenever they start Matlab regardless of the directory where they started it. An example of what I added to my own personal startup.m file is
addpath(genpath('/Users/jmlopez/matlabcode/'))
Now I can add as many folders inside that directory and all of them will be added
to the path every time I start Matlab automatically without having to modify the path.
The question is: Did Matlab already provided a special file like the one I created or did I just go through all this trouble to accomplish what I wanted? If the answer is the second option I gave, then, why doesn't Matlab provide this? It is such a pain in the ass to add directories to the Matlab path whenever you do not have admin permissions and I do not want to carry my startup.m file to every directory I go to. Can someone shed some light into this please?
You can save the pathdef file (which stores all the paths you add) to a custom directory. The problem however is that when matlab starts, it doesn't automatically know which custom directory you used in the previous session.
But that's where the MATLABPATH environment variable comes in. Because this allows to set the matlab starting path yourself. In linux this is simply done by setting this environment variable MATLABPATH before starting matlab (from a terminal / in your .bashrc / ...)
export MATLABPATH=$HOME/.matlab
This way you can let all users have their own pathdef file, which solves the problem of having to add them manually at startup.
EDIT
I tested out if adding startup.m to that MATLABPATH directory worked, ie: does matlab run that startup file? ... and it does. I think it doesn't work for you, because there is another startup.m file in some other (higher priority) directory (probably matlabroot), so that gets precedence. My only startup file is in MATLABPATH, so there is only one choice.
EDIT2
Nope, I added startup to matlabroot directory, and still my own startup file in .matlab gets run. Are you sure you set the MATLABPATH correctly before you started matlab?
I have a file called lol on C:\. So when I run fopen('C:\lol','a'); to open the file, MATLAB can't open it. I think it's looking for a .txt or .m file extension.
How do I open this file in append mode as I want to append data to the file?
You probably don't have UAC (user access control) to create/modify files in C:\. Try some "safe" location like your Desktop.
Try turning on file extensions. Why can't you just change the format of the file to a .txt or whatever format you want.