You have two layers of problems:
- The code was written expecting libsvm's svmtrain() function, not MATLAB's svmtrain() function. MATLAB's svmtrain() function did not accept a command as the third parameter; after the second parameter it expects name/value pairs
- You are executing in a system in which libsvm is either not installed or else is later on the path than the Statistics and Machine Learning Toolbox is
- MATLAB's svmtrain has been replaced by fitcsvm, which takes different options than MATLAB's svmtrain did, neither of which was compatible with the "cmd" syntax of libsvm
At this point you can either install libsvm (earlier on the path than the Stats toolbox), or you can update to fitcsvm with parameters appropriate to do equivalent actions to what would have been done with the libsvm call.
I would need to see what was in cmd to suggest what the fitcsvm equivalent would be.
