Using the C Math Library

Reading Data from a MAT-File 

Using mlfLoad(), you can read in mxArray data from a binary MAT-file. The prototype for mlfLoad()

void mlfLoad(mxArray *file, ... );

where file points to an mxArray containing the name of the MAT-file and the variable argument list consists of at least one pair of arguments - the name of the variable that you want to load and a pointer to the address of an mxArray variable that will receive the data. The last argument to mlfLoad() is always a NULL, which terminates the argument list:

• You must indicate the name of each mxArray variable that you want to load.
• You can load as many variables as you want in one call to mlfLoad().
• There is no call that loads all variables from a MAT-file globally.
• You do not have to allocate space for the incoming mxArray.  mlfLoad() allocates the space required based on the size of the variable being read.
• You must specify a full path for the file that contains the data. The library appends the extension .mat to the filename if you do not specify it.
• You must load data from a binary MAT-file, not an ASCII MAT-file.

Note    Be sure to transmit MAT-files in binary file mode when you exchange data between machines.

For more information on MAT-files, consult the online version of the MATLAB Application Program Interface Guide.

Writing Data to a MAT-File

Example - Saving and Loading Data (ex5.c)