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'));
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'));
save(fullMatFileName , 'flow');
fullMatFileName = sprintf('%s_pressure.mat', mfilename('fullpath'));
save(fullMatFileName, 'pressure');
Best Answer