MATLAB: How to save matlab workplace variables by including original file names

saveworkplace variable

Hi I would like to know how I can save the matlab output files (i.e. matlab workplace variables), by including original file name.

e.g. I open a file (filename.matlab) with (load filename.matlab). Then I run a code to do calculation and I get some workplace variables (e.g. flow, pressure). I want to save those variables as filename_flow.mat and filename_pressure.mat.

I will use the same code on different filename, so I would like to know how I can save my variables as mentioned above (i.e. including the originalfile name)?

Best Answer

Not sure what you're asking, but I'll take a guess.

You can save both to a single file called "yourMfilename.mat", where yourMfilename is whatever your filename is. For example, if your m-file is called test.m, then you can get test.mat in your code like this using mfilename():

fullMatFileName = sprintf('%s.mat', mfilename('fullpath')); % Get base name from m-file name.


save(fullMatFileName , 'flow', 'pressure');

Or you can save each variable to its own .mat file if you want:

fullMatFileName = sprintf('%s_flow.mat', mfilename('fullpath')); % Get base name from m-file name.
save(fullMatFileName , 'flow');
fullMatFileName = sprintf('%s_pressure.mat', mfilename('fullpath')); % Get base name from m-file name.
save(fullMatFileName, 'pressure');

Related Solutions

MATLAB: Saving problems, desired name

Try this:

% Get the name of the file that the user wants to save.
% Note, if you're saving an image you can use imsave() instead of uiputfile().
startingFolder = userpath % Or "pwd" or wherever you want.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
if baseFileName == 0
  % User clicked the Cancel button.
  return;
end
fullFileName = fullfile(folder, baseFileName)
% Now save whatever variables you want into a mat file
save(fullFileName, 'yourVariable1', 'yourVariable2');

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: Saving problems, desired name

MATLAB: Problems with saving and loading inside functions

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