Why does the "matfile" function create files larger in size compared to the "save" function?
显示 更早的评论
Comparing "matfile" and "save" with "-v7.3" shows different file sizes if the variables are objects (e.g. tabular classes, or Simulink objects like "Simulink.Signal").
If you save certain variables (object, e.g., tabular classes, or Simulink objects like "Simulink.Signal") with "save" (option "-v7.3"), the resulting file size is much smaller compared to using the "matfile" function to update existing variables in the MAT file.
采纳的回答
MathWorks Support Team
2026-4-21，0:00
编辑：MathWorks Support Team
2026-4-21，9:02
0 个投票
This is a known limitation when updating existing variables in a MAT-File: the MAT-File's size can increase, especially if the variable is an object. Using the "matfile" object to update variables is equivalent to using "save" with the "-append" flag. Therefore, you see the size increase using the "matfile" object and using "save" with "-append".
The only workaround is to re-save to a new MAT-File, using "save" or "matfile" object (to a new MAT-File). This would create a whole new file, and the size would be, as one would expect.
This is also documented in this Bug Report.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Workspace Variables and MAT Files 的更多信息
2017-8-21
2026-4-21，9:02
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
