How to save and append variable into a matlab file?

Question

MP 2022-7-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1764095-how-to-save-and-append-variable-into-a-matlab-file

评论： MP 2022-7-20

采纳的回答： Chunru

在 MATLAB Online 中打开

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

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Answer 1

Chunru 2022-7-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1764095-how-to-save-and-append-variable-into-a-matlab-file#answer_1011440

编辑：Chunru 2022-7-20

在 MATLAB Online 中打开

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              