Using the C Math Library

Writing Data to a MAT-File

Using mlfSave(), you can save the data within mxArray variables to disk. The prototype for mlfSave() is

void mlfSave(mxArray *file, const char* mode, ... );

where file points to an mxArray containing the name of the MAT-file and mode points to a string that indicates whether you want to overwrite or update the data in the file. The variable argument list consists of at least one pair of arguments - the name you want to assign to the variable you're saving and the address of the mxArray variable that you want to save. The last argument to mlfSave() is always a NULL, which terminates the argument list:

• You must name each mxArray variable that you save to disk. A name can contain up to 32 characters.
• You can save as many variables as you want in a single call to mlfSave().
• There is no call that globally saves all the variables in your program or in a particular function.
• The name of a MAT-file must end with the extension .mat. The library appends the extension .mat to the filename if you do not specify it.
• You can either overwrite or append to existing data in a file. Pass "w" to overwrite, "u" to update (append), or "w4" to overwrite using V4 format.
• The file created is a binary MAT-file, not an ASCII file.

Importing and Exporting Array Data

Reading Data from a MAT-File