What I don't understand is that using the tstep formula, it gives me something like 0.9 (300/330).
My problem is that I have defined a final_time value to top the simulation. But it happens that the value of d for example has more columns than the vector time. For example d can be 1x400 and time still stays 1x301.
So I need to "rescale" the vector time, and that's why I want to use a different time step, so both vectors can have the same length and can be plotted together.