The function py.RunJulia.script(a,b); does the work ... You see the time reduces on the 2nd call. I.e. Julia has compiled and will do for the rest of the MATLAB session. Comparing this speed to Julia ...

It is often useful to translate a librosa function call to its equivalent MATLAB function call. This is the case for example when you have access to a python script or function, and want to implement ...