I want to save a mat. file each time the program runs with a different name.

for example, when I run program for the first time i want to save it as ' text1.mat' second time 'text2.mat' etc...

Answer 1

[Jan]

Folder   = tempdir;   % Define accordingly
FileList = dir(fullfile(Folder, 'text*.mat'));
NewFile  = fullfile(Folder, sprintf('text%d.mat', numel(FileList) + 1));

This fails, if you delete some of the files afterwards. Then this helps:

• https://de.mathworks.com/matlabcentral/fileexchange/10959-sort-nat--natural-order-sort
• https://www.mathworks.com/matlabcentral/fileexchange/34464-customizable-natural-order-sort

NameList  = natsort({FileList.name});
LastIndex = sscanf(NameList{end}, 'text%d.mat'));
NewFile   = fullfile(Folder, sprintf('text%d.mat', LastIndex + 1));

Or prefer:

nowStr  = datestr(now, 'yyyy-mm-dd_HHMMSS');
NewFile = fullfile(Folder, ['text', nowStr, '.mat']);

But remember that this fails, if you create more than 1 file per second or during the change of the daylight-saving-time.

[arvind ramasamy]

the answers are useful.

I wish to know, I am giving a constant current everytime to predict the battery discharge .

so I am running a script which calculates lots of values. i am taking only 4 values out of it to plot my graph for different amps and compare it.

I save each one manually from workspace and load it again.

But i want now instead of manually doing it. the script has to automatically generate a name like this ' Test_1amp.mat, the next time when i give 2 amps test_2amp.mat

could you please help out in this??

[Walter Roberson]

NameList  = natsort({FileList.name});
LastIndex = sscanf(NameList{end}, 'test_%damp.mat'));
NewFile   = fullfile(Folder, sprintf('test_%damp.mat', LastIndex + 1));