I have a file from MATLAB in (.mat) format. I want to import this in GRASS GIS, but I get the following warning.

enter image description here

  • 1
    m files contain matlab scripts no data. You can't open them in GRASS.
    – Zoltan
    Dec 3, 2020 at 7:45

2 Answers 2


The .m file is not readable by GRASS: you need to save your data in a .mat file

in matlab (note that I force the use of version 4):

  • Thanks, my friend. You are right, of course I also meant the .mat format, but I mistyped the .m (as shown in the image above.) What do you mean by (-v4)? Explain a little.Thanks for your guidance
    – saeed
    Dec 3, 2020 at 17:32
  • by default the mat file will be exported in the latest Matlab version, but the grass tool needs version 4 (an older version)
    – radouxju
    Dec 4, 2020 at 8:58

You can use the SciPy scipy.io to read and write .mat files using the functions loadmat and savemat in Python. https://docs.scipy.org/doc/scipy/reference/io.html

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