MATLAB Answers

big differences in saving variables

조회 수: 1(최근 30일)
Abolfazl Nejatian
Abolfazl Nejatian 2020년 9월 24일
댓글: Mario Malic 2020년 9월 26일
Hi,
i need to save some tables and variables as Mat and CSV files.
but I have faced a strange behavior on saving the files.
when I save my file and evaluate the time of each of them individually, the saving time much less than I evaluate total saving time.
I also should mention the true elapsed time is a bigger time.
here are my code and output,
folderAddress = 'D:\Nejatian\';
tic
delete([folderAddress 'signals.csv'])
delete([folderAddress 'LatestSignals.csv'])
t1 = toc;
tic
writetable(T,[folderAddress 'signals.csv']);
t2 = toc;
tic
writetable(lT,[folderAddress 'LatestSignals.csv'])
t3 = toc;
tic
save([folderAddress 'visualData'],'visualData')
t4 = toc;
tic
delete('workspace.mat')
save('workspace.mat');
t5 = toc;
str1 = string(['Deleting CSV files = ' num2str(t1) 'Sec']);
str2 = string(['Writing CSV file one = ' num2str(t2) 'Sec']);
str3 = string(['Writing CSV file one = ' num2str(t3) 'Sec']);
str4 = string(['Saving Mat file from a struct variable = ' num2str(t1) 'Sec']);
str5 = string(['Saving all workspace variables = ' num2str(t1) 'Sec']);
disp([str1;str2;str3;str4;str5]);
  • Deleting CSV files = 0.0320444Sec
  • Writing CSV file one = 1.99078Sec
  • Writing CSV file one = 0.273289Sec
  • Saving Mat file from a struct variable = 0.0120444Sec
  • Saving all workspace variables = 0.00220444Sec
and the total time is
tic
folderAddress = 'D:\Nejatian\';
delete([folderAddress 'signals.csv'])
delete([folderAddress 'LatestSignals.csv'])
writetable(T,[folderAddress 'signals.csv']);
writetable(lT,[folderAddress 'LatestSignals.csv'])
save([folderAddress 'visualData'],'visualData')
delete('workspace.mat')
save('workspace.mat');
t=toc;
str = string(['Total time = ' num2str(t) 'Sec']);
disp(str);
  • Total time = 78.3331Sec
why this big difference happens and how i can speed up my File saving time?
i mean is there any way to parallelize or decompressed the output for reducing the saving file?
  댓글 수: 5
Mario Malic
Mario Malic 2020년 9월 26일
There's an option -nocompression, but I don't know if it would make things different.

댓글을 달려면 로그인하십시오.

답변(0개)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by