I tried to save my file using the command window in Matlab. Unfortunately it replaced my file with a new file. And now I am unable to get it back.
It's probably easy, but I am new to using the command window in Matlab.
You are out of luck on this one. Saving to a file will irretrievably overwrite any existing file with that name unless you specify otherwise with the -append option. In the future, if you have a data set that is important because it is either not reproducable or because it takes a long time to generate it, I would recommend either backing it up or saving it with a timestamp. This is one example:
function save_t(name,varargin)
save(sprintf('%s-%d',name,time),clock*[1e8 1e6 1e4 1e2 1 0].',varargin{:});
end
Save this to a file in you matlab path named "save_t.m" and then you can simply call it just like you would call the save function, but now it will add on a timestamp.
save_t filename
This will help to ensure that you don't accidentally overwrite an existing file.
Related
Working on my script in Matlab, I want to rename a variable, but only the upcoming instances of it the current script.
I am familiar with Matlab rename option when pressing Shift+Enter.
But this changes all the instances of my 'new' variable in the whole script.
I want to change only the proceeding instances.
How could this be done? I also didn't find anything helpful in the Find&Replace window.
Copy the remaining portion of your code into a new .m file
Find and replace the variable you want to change.
Copy and paste it back into your original .m file.
I want to save a matrix (e.g. "PTX_Data_Raw.mat") in another folder (e.g. Temp folder). I have written below code:
mkdir('D:\Projects\ProgrammingPart\Method2_FinalApproved\8-congruent','Temp');
filename=('D:\Projects\ProgrammingPart\Method2_FinalApproved\8-congruent\Temp');
save(filename,'PTX_Data_Raw.mat');
but it didn't work. Does anybody can help me for solving this problem?
THX
Going with your comments, you are using save wrong. The first parameter is the filename you want to call the MAT file and second parameter and onwards are the variables you want to save.
Therefore, you need to make sure filename contains the entire filename, including the path followed by the actual name of the MAT file you want. After, the second parameter is PTX_Data - the name of the matrix you want to save.
mkdir('D:\Projects\ProgrammingPart\Method2_FinalApproved\8-congruent','Temp');
%// Change
filename=('D:\Projects\ProgrammingPart\Method2_FinalApproved\8-congruent\Temp\PTX_Data_Raw.mat');
save(filename,'PTX_Data'); %// Change
I have more than 30 save setpath in Matlab and I want to remove them first and test something and later on, I want to add them back. What would be optimized way of achieving this. Is there a method to get the list of saved setpath and later on add paths in setpath by providing a list. I tried getnpath and it returns the matlab toolboxes path.
Create a backup of paths in a mat file -
path_list = path;
save('paths.mat','path_list');
Do your thing of removing 30 saved paths by going to Set Path option on the File menu and do whatever testing you were looking to do.
Once done with the testing, now you wish to add back the deleted paths. So restore the paths from the backed up mat file -
load('paths.mat')
path(path_list)
I have a loop which my main script run through that. I wounder to save some of my variables in different directory every time that my loop is running. I have used following script but its not working:
for i=1:size(whisk, 1);
my codes is here and it creates variables in my workspace like [format, measurements].
the rest is what I wote to save this variables:
mkdir('C:\videos\results\', num2str(i));
dumvar=0; % As matlab has problem with data>2GB, then I use this 2 line code for saving
save('measurenments','dumvar','-v7.3');
save(fullfile('C:\videos\results\', num2str(i),'measurenments'));
clear all;
close all;
end
but Unfortunately its not work!!!!!!!!!!!
Any help would be appreciated.
Sam
Except that measurenments is wrongly spelled (correct spelling is measurements), there is not so strange that it does not work. The first call to save, saves the variable dumvar in the current folder, with the format v7.3. The second call to save, saves the whole workspace as a file fullfile('C:\videos\results\', num2str(i),'measurenments'). Try this,
save(fullfile('C:\videos\results\', num2str(i),'measurenments'),'dumvar','-v7.3');
However it seems as the folder fullfile('C:\videos\results\', num2str(i),'measurenments') does not exist since you only create the folder mkdir('C:\videos\results\', num2str(i))
. Then matlab cannot save anything there. Try either to save as fullfile('C:\videos\results\', [num2str(i),'measurenments']) or create the directory mkdir('C:\videos\results\', [num2str(i),'\','measurenments']);
`
Is it possible to save workspace variables from a function that I am calling and cannot explicitly edit without file I/O?
I know I can use the save function to save all of the variable names in a workspace, but what if I wanted to save the workspace variables from a function that I am calling, like a built in function (mean, sum, etc).
I would like to save all of the variables from a function's workspace before it returns back to the function I am writing, and I would like to do it without opening the file each time and adding an extra line of code; is this possible?
In case anyone is interested:
I have yet to find a solution to the exact question I asked, but I found a solution that works well enough with a little extra file tracking.
Using the function onCleanup, you can specify that all the variables be saved right before the function returns to the caller. Using this and a little file parsing, you can open the code in question as a simple text file, and insert the onCleanup code anywhere in the file (easier than inserting save as the last line). Then, you can run the code and track the new .mat file using the previous file name or any naming method you choose.
That will enable you to save all the variables in a workspace just before the function exits, but it does require file parsing, see simple example below:
readFile = fopen('filename.m');
writeFile = fopen(['filename_new.m']);
%Ignore the first line (hopefully the function header, may need extra parsing if not)
functionHeader = fgets(readFile);
%Print the function header
fprintf(writeFile,functionHeader);
%Print the clean-up code
%NOTE: This can go anywhere in the file
fprintf(writeFile,sprintf('onCleanup(#()save(''%s.mat''))\n',filename)));
nextLine = fgets(readFile);
while ischar(nextLine)
fprintf(writeFile,nextLine);
nextLine = fgets(readFile);
end
With the above, a new file is created (filename_new.m) which needs to be run, and will create a mat file (filename.mat) with all of the workspace variables in it.
eval(newFileName(1:end-2));
Now, by tracking the .mat file, you can do whatever is necessary after this point. For my purposes, I was interested in the memory used by the said function, which is available by accessing the mat object of the .mat file.
matObj = matfile('filename.mat');
stats = whos(matObj);
fileSize = sum([stats.bytes]);
Try the "save" function.
Add this line in your called function:
save('filename')
Here is my sample code:
a=10; b=6;
c=addition(a,b);
And the function is defined as:
function [out]=addition(a,b)
out=a+b;
temp1=a;
temp2=b;
temp3=a-b;
save('C:\data.mat');
end