I'm trying to make a .m file that uses a .dll file and I want to be able to pass my script to other people without error. The only problem is that matlab always searches starting at the matlabroot or some drive if you specify. The location of the folder containing this project is going to vary depending on the user. So I can't simply use the function:
loadlibrary("C:\Users\Public\Documents\projectFolder\file.dll", "C:\Users\Public\Documents\projectFolder\file.h")
in my .m file assuming that every user has the project folder in "C:\Users\Public\Documents".
I'm trying to see if there's a way for matlab to just know where the .m file is and start at that path, then maybe I could set the code up like this:
path = [some code which finds the path of .m file];
loadlibrary(strcat(path, 'file.dll'), strcat(path, 'file.h'));
Thanks
MATLAB requires any .m file to be in its search path before it will run it (I don't think that's strictly true, but it will complain mightily if it isn't). Users can add and/or subtract directories from their path pretty easily, and so it's a safe assumption that if the user has installed your script, they've put it somewhere in their MATLAB path. If they haven't, and they try to run it, MATLAB will pop up a dialog warning that the script is not in the path and asking if they would like to temporarily add it.
As to how to find it and how to use that information, you'd do something like this:
scriptLocation = mfilename('fullpath');
[directory,name,extension] = fileparts(scriptLocation);
dllLocation = fullfile(directory,[name '.dll']);
headerLocation = fullfile(directory,[name '.h]);
loadlibrary(dllLocation, headerLocation);
Related
I have a question about a code I am creating.
I have a code in a .m file, let's name it as "first.m".
But in the "first.m" i would like to write a command in this script in which I would like to run and execute an another .m file, let's name it "second.m" file, which is in a different directory.
I mean I would like to use a subroutine, but the main problem is that I do not have understand how can I use subroutines in MATLAB.
Could anyone help me to make it?
try coding using the run function.
It is important that Matlabs knows where to find that function. You can use the function addpath
Also, you can actually copy the full path in that command. Like this:
run('C:\Users\user\Desktop\second.m')
Make sure you write the correct path that contains second.m. If the code is in the same path as first.m or you have already added the path you can use:
run('second.m')
And if they are in a subfolder of the actual folder where first.m is, you can use the first example or:
run('subfolder\second.m')
My team is trying to standardise our Matlab paths so that everyone has the same.
I have a list of the default matlab path that we should all have.
So we would like to have a script that runs when matlab opens to make sure that our paths are set to the default matlab path. So if a path has been added to our default list it will be added in the correct place.
Is this possible in Matlab?
I read about startup but that seems to do with set your working directory which is different to what I am trying to do.
You can change which directory MATLAB starts in using the userpath function so that whenever you start up MATLAB, the path will automatically redirect here.
This may be useful if you have MATLAB running on a network per se, and multiple instances can start in the same network directory.
See more from MathWorks here: http://www.mathworks.com/help/matlab/matlab_env/matlab-startup-folder.html
However, if you want to standardize everything so that everyone has access to the same path, you can use startup to add directories / folders to MATLAB's path, but if you want to complete the package, use userpath to get MATLAB to start at a specified directory.
Your startup.m file may look something like this:
addpath('/folder/to/add/one');
addpath('/folder/to/add/two');
addpath('/folder/to/add/three');
addpath('/folder/to/add/four');
Then set your userpath with the function to complete everything:
userpath('/folder/to/start');
addpath('/folder/to/start');
Also make sure you add this new folder to your startup.m file too.
Include a path or addpath line in file startup.m. For example, to add folder aaa\bbb to the path the line would be
addpath('aaa\bbb')
Note that each user may have a different startup.m file. You may need to create it, if it doesn't already exist.
I have created a few general function in MATLAB that I intend to use for a few separate projects. However I do not want to copy the function into each separate project function.
I have created a folder called Misc_Function when I have placed these general functions. I know I can reference this functions explicitly by using the path and function name when trying to call the functions.
I believe you can add a path (in my case 'H:\MyTeam\Matlab\Misc_Function') when MATLAB loads up is that correct and if so how do you do this?
Assuming the above can be done I'm interested to know how MATLAB finds the correct function. In my understanding (guess work) MATLAB has a list of paths that it check trying to find a function with the name specified - is that correct? If so what happens when there are functions with the same name?
MATLAB indeed has its own search path which is a collection of folders that MATLAB will search when you reference a function or class (and a few other things). To see the search path, type path at the MATLAB prompt. From the documentation:
The order of folders on the search path is important. When files with the same name appear in multiple folders on the search path, MATLAB uses the one found in the folder nearest to the top of the search path.
If you have a set of utility functions that you want to make available to your projects, add the folder to the top of the search path with the addpath function, like so
addpath('H:\MyTeam\Matlab\Misc_Function');
You have to do this everytime you start MATLAB. Alternatively, and more conveniently, save the current search path with the savepath command or add the above commands to your startup.m file.
You can check the actual paths where Matlab searches for functions using
path
You will notice, that the most top path (on start up) is a path in your home folder. For Linux this is e.g. /home/$USER/Documents/MATLAB. For Windows it is somewhere in the the c:\Users\%USER%\Documents\Matlab (I think). Placing a file startup.m in this folder allows to add additional paths using
addpath('H:\MyTeam\Matlab\Misc_Function');
or
addpath(genpath('H:\MyTeam\Matlab\Misc_Function'));
on start up of Matlab. The latter (genpath) allows to also add all subdirectories. Simply write a file startup.m and add one of above lines there.
I believe 'addpath' will add the folder to MATLAB path only for the current MATLAB session. To save the updated path for other sessions, you need to execute 'savepath' command.
As mentioned in the previous comments, adding the folder in startup.m is a good idea since it will be added to the path on MATLAB startup.
To answer your question about how MATLAB finds the correct function, MATLAB maintains a list of directories in its path in a file called pathdef.m. Any changes to the path will be written to this file (when you execute 'savepath'). The path variable is initialized with the contents of this file.
I have added a lot of paths to matlab and now I want to share my code, but I don't know exactly which function (in which path) I should add to my shared code. Each time I need to add a missing function and it is really bothering for me and the users who are using the code.
So, I would like to restore the matlab path to its original case. Is there any way to do this in matlab? I also want to keep a backup of my current added path in a .m file and use it later when I am done.
To restore the path to default value - http://www.mathworks.com/help/matlab/ref/restoredefaultpath.html
restoredefaultpath sets the search path to include only folders for
MathWorks® installed products. Use restoredefaultpath when you are
having problems with the search path.
restoredefaultpath; matlabrc sets the search path to include only
folders for MathWorks installed products and corrects search path
problems encountered during startup.
And to save the current path - http://www.mathworks.com/help/matlab/ref/savepath.html
savepath updates the MATLAB® search path for all users on the system
so that the path can be reused in a future session. savepath saves the
search path to the pathdef.m file that MATLAB located at startup, or
to the current folder if a pathdef.m file exists there.
Or you can just store path in variable p = path; and restore it later path(p);. If the path is saved into pathdef.m the call of pathdef returns the string that can be used to set the saved path.
I wrote a MATLAB program with a GUI (to enter the measurement settings) and a measurement function which gets called when pressing "START" in the GUI.
In both I use separate files for sub functions to keep it easier to read and maintain.
The file structure looks something like this
C:/../folder/+measure/measure.m
C:/../folder/+measure/getData.m
C:/../folder/+measure/plot.m
C:/../folder/+measure/evalutate.m
C:/../folder/+measureGUI/getGuiData.m
C:/../folder/+measureGUI/calcLimits.m
C:/../folder/+measureGUI/saveGuiState.m
C:/../folder/+measureGUI/loadGuiState.m
C:/../folder/+measureGUI/background.png
C:/../folder/+measureGUI/guiState.mat
C:/../folder/measureGUI.fig
C:/../folder/measureGUI.m
This works, if I'm executing the measureGUI.m in "folder".
The current settings in the GUI are saved in the guiState.mat file when closing the GUI in saveGuiState.m
filename = '+autoProberGUI/guiState.mat';
save(filename, 'guiState');
And loaded (by loadGuiState.m) the next time the GUI gets opened.
Now I have to put the finished program on a network drive and add the folder to my matlab search path to call measureGUI.m.
The program works but it can't save or load the guiState.mat due to the relative path (I guess the path is relative to the folder I'm currently in, and not the folder the calling function is in).
I think I could include the subfolder to the search path or use an absolute path in filename. But both solutions seem to me to be not the proper way.
Is there a way to have relative paths to the file from where the function is located on the drive? Meaning relative to
I:/..NetworkDrive../folder/+measureGUI/saveGuiState.m
instead of relative from where I call measureGUI.m
(Sorry for the poor English, I hope it is not too confusing)
You can use pwd to get the full path to you current working directory.
Then you can concatenate with [pwd '/folder/+measureGUI/saveGuiState.m'].
To locate the function you can use which.