How to save and append variable into a matlab file?

I would like to save variable "i" in a mat file "paxt.mat". This is to be saved in the current directory.

The varaible "i" varies with each loop hence need to append it.

I tried :

save(fullfile(pwd,'paxt4.mat'),'i','-append'); % OR
save('paxt4.mat','i','-append');


Error using save
Unable to write file D:\..\paxt.mat: No such file or directory.

Both of these does not work. I do not undestand what is wrong.

Any help will be greatly appriciated.

Thanks in advance

Answer 1

[Chunru]

You can use mat-file objuect. doc matfile for mor details.

% work with the .mat file using matfile object
matobj = matfile('paxt4.mat', 'Writable', true);
matobj.i=[];

for k=1:5
    i = randn(1,1);
    matobj.i = [matobj.i i];
end

matobj.i

ans = 1×5

-0.2966 -0.4702 -1.5783 -0.8970 -0.9910

whos('-file', 'paxt4.mat')

  Name      Size            Bytes  Class     Attributes

  i         1x5                40  double              

[MP]

@Chunru thanks for trying, It did not work either.

[Chunru]

See the update.

[MP]

Yes, that magic worked!

Thank you so much @Chunru.