How to save matlab workplace variables by including original file names

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)?

Answer 1

[Image Analyst]

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');

[mee mee]

Hi thank you very much for your answer. But it is a little bit different from what I want. Actually, I should have mentioned more specifically in my question, sorry for confusion. Ok, below should be more clear.

I have series of matlab data files. (e.g. a.mat, b.mat, c.mat, d.mat...etc).

And I have a matlab code (e.g. code.m).

So, I load one of my data files

    load a.mat

Then I run code.m on a.mat data file for calculation. Then I get output variables of "pressure" and "flow".

When I use your script mentioned above, the output variables are saved as below:

code_flow.mat code_pressure.mat

But what I would like to see is a_flow.mat a_pressure.mat

So,when I run the same code.m on b.mat, I will get b_flow.mat and b_pressure.mat

Is it possible to save in that way. Thank you very much for your time.

[Image Analyst]

Try this:

% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = 'C:\Program Files\MATLAB';
if ~exist(startingFolder, 'dir')
  % If that folder doesn't exist, just start in the current folder.
  startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.mat');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
  % User clicked the Cancel button.
  return;
end
% Get the name of the input .mat file.
fullInputMatFileName = fullfile(folder, baseFileName)
% load(fullInputMatFileName);
% Get it without the extension
[~, baseNameNoExt, ~] = fileparts(baseFileName)
% Get the name of the two output .mat files.
baseFileName = sprintf('%s_flow.mat', baseNameNoExt);
fullOutputMatFileName1 = fullfile(folder, baseFileName)
baseFileName = sprintf('%s_pressure.mat', baseNameNoExt);
fullOutputMatFileName2 = fullfile(folder, baseFileName)

Then, with those two filenames, call save() twice like I already showed you.

save(fullOutputMatFileName1, 'flow');
save(fullOutputMatFileName2, 'pressure');

[mee mee]

wow that works totally!! Thanks a lot.