In this case the default mat file version is 7 3.
Save mat file version 7 3.
Then append a third variable without compression to the same file.
That is why the warnning message sounds strange.
Use the matfile function to access matlab variables directly from mat files on disk without loading the full variables into memory.
While saving as version 7 3 works i cannot load or import the new mat file into r2017a.
Your matlab is r2010a which should be later than v7 3.
To identify or change the default mat file version access the mat files preferences.
By default all save operations create version 7 mat files.
Use the matfile function to create files in version 7 3 format.
It complaints that you try to save to a mat file older than 7 3.
By default all save operations create version 7 mat files.
Partial loading and saving requires version 7 3 mat files any load or save operation that uses a matfile object associated with a version 7 or earlier mat file temporarily loads the entire variable into memory.
Create two variables a and b and save them to a mat file version 7 or 7 3.
If you look at the help of save v7 3 means version 7 0 features plus support for data items greater than or equal to 2gb on 64 bit systems which should be in your advantage.
The save variables to version 7 3 mat file example on that page shows the exact syntax.
The only exception to this is when you create new mat files using the matfile function.
The only exception to this is when you create new mat files using the matfile function.
When you create a new file using matfile the function creates a version 7 3 mat file that also lets you save variables larger than 2 gb.
In order to save your data to a mat file with version 7 3 or later specify the v7 3 flag as the version input argument.
How to save v7 3 format variable quickly in few.
Learn more about v7 3 save variable 2gb.
By default the save function compresses variables a and b before saving them to myfile mat.
Save two variables to a mat file.
In this case the default mat file version is 7 3.
Open the documentation for the save function using doc save.
