MATLAB: Hi all :how to save some new variables to different mat file

save new variables separately

I have a code written to create some variables. At the beginning of the code, it loads the file "ws0722.mat" file. because of the "ws0722.mat" contains some variables which are used inside the new code to create new variables. how can I only save the new variables to new mat file, save function doesn't work for me as I have more (> 15) variables to name e:g save ('ws0722_B','s','a') if anybody can help,much appreciated Thanks

Best Answer

Before the load, use

existing_names = {};
existing_names = who();

then do your load and so on.

When you are ready to save, do

new_names = setdiff(who(), existing_names);
save(('ws0722_B', new_names{:});

Related Solutions

MATLAB: How to save one variable from one .mat file to another .mat file

Something like this

files = dir('*.mat');
folder_path = 'C:\...'; % path to folder where you want to save the new files
for i = 1:numel(files)
    old_name = files(i).name;
    new_name = strrep(old_name, '.mat', '_data.mat');
    new_name = fullfile(folder_path, new_name);
    data = load(old_name);
    data = data.data;
    save(new_name, 'data');
end

MATLAB: Problems with saving and loading inside functions

Use the '-append' option of save so you don't blow away your existing variables inside the mat file when you save the additional variables in the same file. Like this (untested):

In function f1:

folder = 'var';
baseMatFileName = 'x.mat';
fullMatFileName = fullfile(folder, baseMatFileName);
if exist(fullMatFileName, 'file')
    % Append some variables onto an existing file.
    save(fullMatFileName, 'variable1', 'variable2', 'y1', 'y2', '-append');
else
   % Save some variables into a new file. (This would blow away/replace an existing file.)
    save(fullMatFileName, 'variable1', 'variable2', 'y1', 'y2');
end
% Save some more variables without destroying the existing ones.
save(fullMatFileName, 'y1', 'y2', '-append');

In function f2:

folder = 'var';
baseMatFileName = 'x.mat';
fullMatFileName = fullfile(folder, baseMatFileName);
if exist(fullMatFileName, 'file')
    savedVarStructure = load(fullMatFileName);
    % Get variable1:
    variable1 = savedVarStructure.variable1;
    % Get variable2:
    variable2 = savedVarStructure.variable2;
    % Get y1:
    y1= savedVarStructure.y1;
else
    warningMessage = sprintf('Mat file not found:\n%s', fullMatFileName);
    uiwait(warndlg(warningMessage));
end

Best Answer

Related Solutions

MATLAB: How to save one variable from one .mat file to another .mat file

MATLAB: Problems with saving and loading inside functions

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