MATLAB: How to read MDF Files into Matlab

Question

I'm attempting to read MDF (.mf4) files into Matlab workspace. I'm using the following commands:

mdfObj = mdf('datafile.MF4');

data1 = read(mdfObj);

but get the following error:

Functionality is not implemented for the MDF file.

I have the Vehicle Network Toolbox installed which I think should allow for this read command.

Can you please advise?

Thanks,

Keith

Answer 1

The error you are encountering often occurs when the MDF file is not sorted. By applying a data sort to the file, it becomes readable.

You can use “mdfSort” function to sort the file and make the file readable.

mdfSort ('oldFile.mdf', 'newFile.mdf');
mdfObj = mdf('newFile.mdf');
data = read(mdfObj);