I was at the middle of a project and accidentally deleted one of my major folder which contains all my signals.
All of the signals was in .mat format and each of them has considerably large size.
After taking my laptop to support center, they recovered my file but nearly all my .mat files could not be read (all other type such as .m or simulink file are readable).
I checked various method, but all of them says the .mat "file might be corrupt" so I want to see
Is there specific method to recover my missed .mat files?
Is there any way I could fix the corrupted .mat file or some part of it?
I checked various method such as
loading .mat file in matlab
checking the file by matfile
try to read the ,.mat file by fopen and fread
using "splitmat" code on my .mat file , as mentioned here [link] (https://www.mathworks.com/matlabcentral/answers/98890-how-do-i-recover-data-from-a-corrupt-mat-file)
but all of them says the .mat "file might be corrupt"
Need to read .dat files (binary files) from local and write the output in console using scala IDE,
Is it required first convert .dat file to .txt/.csv file then we can read and apply if any transformation and again need to convert .txt/.csv to .dat
tried with some existing code
ref:http://alvinalexander.com/scala/how-to-read-write-binary-files-in-scala-examples
still getting error ,Please share any suggestion
Thanks in advance.
Currently I have a zipfile containing several thousand .xml files, extracted the folder is 1.5gb in size.
I have a function that matches data with specific files inside this zip file. I then want to read this specific file and extract additional data.
My question:
Is there any way to extract these specific files from the archive without unzipping the entire archive?
The built in unzip.m function can only be used to unzip the entire file so it won't work so I am thinking I have to use the COM interface or some other approach.
Matlab version: R2013a
While searching for solutions I found this:Read the data of CSV file inside Zip File without extracting the contents in Matlab
But I can't get the code in the answer to work for my situation
Edit:
Credit to Hoki and Intelk
zipFilename = 'HMDB.zip';
zipJavaFile = java.io.File(zipFilename);
zipFile=org.apache.tools.zip.ZipFile(zipJavaFile);
entries=zipFile.getEntries;
cnt=1;
while entries.hasMoreElements
tempObj=entries.nextElement;
file{cnt,1}=tempObj.getName.toCharArray';
cnt=cnt+1;
end
ind=regexp(file,'$*.xml$');
ind=find(~cellfun(#isempty,ind));
file=file(ind);
file = cellfun(#(x) fullfile('.',x),file,'UniformOutput',false);
And not forgetting the
zipFile.close
there are datasets in .mat format in the this site: http://www.cs.nyu.edu/~roweis/data.html
I want to change the format to .csv.
Can someone tell me how to change the format to create the .csv file.
Thanks!
Suppose that the .mat files from the site are available already. In the command window in Matlab, you may write, for example:
load('C:\Users\YourUserName\Downloads\mnist_all.mat');
to load the .mat file; the result should be a set of matrices test0, test1, ..., train0, train1 ... created in your workspace, which you want saved as CSV files. Because they're different size, you need to save one CSV per variable, e.g. (also in the command window):
csvwrite('C:\Users\YourUserName\Downloads\mnist_test0.csv', test0);
Repeat the command for each variable, and do not forget to change also the name of the output file to avoid overwriting.
Did you tried the csvwrite function in Matlab?
Just load your .mat files with the load function and then write them with csvwrite!
I do not have a Matlab license so I installed GNU Octave 4.2.1 (2017) on Windows 10 (thank you to John W. Eaton and others). I was not fully successful using the csvwrite so I used the following workaround. (BTW, I am totally incompetent in the Octave world. csvwrite worked for simple data structures).
In the Command Window I used the following two commands
load myfile.mat
save("-text","myfile.txt","variablename")
When the "myfile.mat" is loaded, the variable names for the data vectors loaded are displayed in the workspace window. This is the name(s) to use in the save command. Some .mat files will load several data structures.
The "-text" option is the default, so you may not need to include this option in the command.
The output file lists the .mat file contents in text format as single column (of potentially sequential variables). It should be easy to use you text editor to massage this data into the original matrix structure for use in whatever app you are comfortable with.
Had a similar issue. Needed to convert a series of .mat files that had two columns of numerical data into standard data files (ascii text). Note that I don't really ever use csv, but everything here could be adapted by using csvwrite instead of the standard save.
Using Octave 4.2.1 ....
load myfile.mat
LI = [L, I] ## L and I are column vectors representing my data
save myfile.txt LI
Note that L and I appear to be default variable names chosen by Octave for the two columns vectors in my original data file. Ideally a script that iterated over all files with the .mat extension in my directory would be ideal, but this got the job done. It saves the data as two space separated columns of data.
*** Update
The following script works on Octave 4.2.1 for a series of data files with the .mat extension that are in the same directory. It will iterate over them and write the data out to text files with the same name but with the extension .dat . Note that this is not efficient, so if you have a lot of files or if they are large it can take a while to run. I would suggest that you run it from the command line using octave mat2dat.m so you can actually watch it go.
I make no guarantees that this will work for you, but it did for me. I also am NOT proficient in Octave or Matlab, so I'm sure a better solution exists.
# mat2dat.m
dirlist = glob("*.mat")
for i=1:length(dirlist)
filename = dirlist{i,1}
load(filename, "L", "I")
LI = [L,I]
tmpname = filename(1:length(filename)-3)
txtname = strcat(tmpname, 'dat')
save(txtname, "LI")
end
Wha am I doing wrong?I need to convert .mat file (MATLAB binary format) to a .txt file so as to read it in C++ later on. I tried follwing in MATLAB:
>>load('file.mat')
>>Conten = who;
>>save('file.txt', Conten{:}, '-ascii')
But, it gives warning: Attempt to write unsupported data type to an ASCII file.
What am I doing wrong? Thanks in advance...