I need to read a group of dat files so when I do this it is working all right.
list_of_files=dir(fullfile('/home/username/Desktop/Old/MTP/Generate/schemes/o33smnpimp/data/', '*.dat'));
The thing is I want to do this for number of schemes (like o33smnpimp) where every scheme folder has a data folder so I tried something like this but it's not working. What could be the problem?
list_of_files=dir(fullfile('../data/', '*.dat'));
My matlab file lies in o33smnpimp folder.
.. indicates the parent directory, . the current directory. your code looks in /home/username/Desktop/Old/MTP/Generate/schemes/ for the sub directory data, assuming your working directory is /home/username/Desktop/Old/MTP/Generate/schemes/o33smnpimp.
Use
list_of_files=dir(fullfile('./data/', '*.dat'));
or
list_of_files=dir(fullfile('data', '*.dat'));
Related
I have the following code which can create a directory within a selected folder:
photos_dir = 'C:\Users\Bob\Photos';
mkdir(photos_dir,'Christmas 2015')
I'd like to then be able to save an image to this folder, I think using something like:
imwrite(img,Christmas 2015,'jpg')
However, this does not select the "Christmas 2015" folder which is in the "\Photos" directory. How can I make the image be written to this location?
First of all, you're going to have a syntax error since Christmas 2015 should at least be a string. But other than that, if you want to save a file in a particular location (other than the current working directory), you need to provide the full path to the file location.
To do this, you need to use fullfile to combine all of your directory and file names together into a full file path.
image_name = fullfile(photos_dir, 'Christmas 2015', 'yourphoto.jpg');
imwrite(img, image_name, 'jpg')
I have a bunch of codes that are currently stored on my local machine. There are two folders, one called "Resources" and another called "src". There is one main script that needs to be run called "main.m" in "src" which calls files from "Resources".
If I copy this whole thing onto a new computer, the paths will change and MATLAB may not be able to find "Resources" anymore. I know that relative to "main.m", I need to go up one level and then into "Resources".
What is the best way of getting MATLAB to point to "Resources"?
I am currently trying along the lines of
P = mfilename('fullpath')
which gives the path for main.m. Now, I want to navigate from here, one folder up and then into "Resources". Or if there is a better way, please let me know.
Eventually, I want to extend it to work for multiple folders "Resources1", "Resources2" etc. so MATLAB needs to be able to navigate to the right folder.
You can get it like:
fullfile(fileparts(mfilename('fullpath')), '..', 'Resources');
Explanation:
mfilename('fullpath') will return the full path and name of the
M-file in which the call occurs, without the extension
fileparts will return the path of the passed file (only the containing directory)
fullfile will build the full directory specification from the folder names passed (Note: '..' always means the parent directory)
Based on this it is quite simple to write a function that gets the sibling directory of the directory containing the file:
getSiblingOfParentDirectory.m
function siblingDirPath = getSiblingOfParentDirectory(filepath, siblingDirName)
siblingDirPath = fullfile(fileparts(filepath), '..', siblingDirName);
end
then to use it in an M-file:
for i = 1:3
disp(getSiblingOfParentDirectory(mfilename('fullpath'), ['Resources', num2str(i)]));
end
Sample output:
D:\pathtest\Resources1
D:\pathtest\Resources2
D:\pathtest\Resources3
You can try the following:
ResourcesFolder = strrep(mfilename('fullpath'), 'src\main', 'Resources');
addpath(ResourcesFolder);
%%Your code here where you need those files
rmpath(ResourcesFolder);
Which is fully dependant on the names of your folders & files of course. Basically "addpath" enables you to access the files in the mentioned directory by adding it to the search path, and "rmpath" does the exact opposite.
Also, if you literally want to navigate to a folder present on one level up, you can execute the following:
cd ..\Resources
Which goes one level up, searches for the folder 'Resources', then changes the current directory to that folder .
I'm new to matlab and I've wrote a code that implements the gamma function for image processing. I generate around 300 photos named '001.jpg' to '300.jpg' and then use ffmpeg to make a video.
In the end, I only need the video result and need a command to delete all the photos generated in the directory! is there a way to do that?
If you want to remove all .jpg files in the current directory you can use the delete command with a wildcard (*)
delete('*.jpg')
If the files live in a folder other than the current directory, you can specify the directory in this way.
folder = '/path/to/my/files';
delete(fullfile(folder, '*.jpg'))
If you want to limit it to just files that have number filenames, you could do something like the following
files = dir('*.jpg');
filenames = regexp({files.name}, '^[0-9]+\.jpg$', 'match', 'once');
filenames = cellstr(cat(1, filenames{:}));
delete(filenames{:})
Adding to Suever's answer (not allowed to comment yet):
Assuming you already know the names of the images you're creating, you could save your script a 'trip' to the folder and back by creating the filenames list yourself thus:
for i=1:numOfImages
filenames(i)={strcat(num2str(i),'.jpg')};
end
delete(filenames{:})
I have a folder named "Photos" that is a subfolder of the current directory. Inside that folder, there are four subfolders with names "Order1", "Order2",
"Order3", "Order4". I am trying to open these subfolders using a loop.
The following code is not working.
for i=1:4
current_path=pwd;
cd(current_path');
cd('Photos\Order%d',i);
end
There are a lot issues going on here at the same time.
The primary issue is that you are changing directories each time through the loop but you're also getting the value of the current directory (pwd) each time. The directory doesn't automatically reset to where you were when it goes back to the top of the loop. I think you expect current_path to be the folder you started in and be the same for all iterations.
You need to use sprintf or something similar to create your "OrderN" folder names. cd doesn't know what to do with the format specifier you're trying to use.
You should always use fullfile when concatenating file paths. Period.
You should use absolute paths when possible to remove the dependence upon the current directory.
Do you really need to change the working directory? If you're trying to load files within these folders, please consider using absolute file paths to the files themselves rather than changing folders.
If you are going to do this this way, please be sure to reset the path back to where it was at the end of the loop. There is nothing worse than running code and ending up in a directory that is different than where you were when you called it.
To actually make your code work, we could do something like this. But given all of my points above (specifically, 4-5), I would strongly consider a different approach.
startpath = pwd;
for k = 1:4
folder = fullfile(startpath, 'Photos', sprintf('Order%d', k));
cd(folder)
end
% Set the current directory to what it was before we started
cd(startpath)
I have an m file which creates an excel file using xlswrite. If I do not specify the the folder for the xls to be output to, the default is the users folder. I would prefer that it goes to the same folder as the m file. Is there a way to generalize this without explicitly entering the m file location? I plan on distributing this m file and not everyone will keep their m files in the same folder.
To get the path where running m-file is stored, check out:
help mfilename
help fileparts
You could simply use the current working folder as the save location. This is whatever the "current directory" is in the matlab window.
You can access it using the command pwd. This returns a string that is the path to the directory.
Then append \filename.ext to it and you'll be good to go!