Morris method

In the global sensitvity analysis Morris method example (Lotka Volterra gsa), the input arguments are

m = gsa(f1,Morris(total_num_trajectory=1000,num_trajectory=150),[[1,5],[1,5],[1,5],[1,5]])

The number of parameters in the equations are 4 so generally in the Morris method the number of runs are r*(p+1) where p is the number of parameters and r the number of different realizations. So here it would be total_number should be 5xr and num_traj should be 5. So I am unable to figure out how you get the number 1000 and 150 in the above example. Can you please clarifiy.

You just posted this question here Global sensitivity analysis Morris Method
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I posted it under the subtopic performance by mistake so re-posted under first steps. Your answer is not the solution.