You have already been shown the variant using the if-function and also the variant using the Heaviside step function. Both look a little confusing in my opinion. The only advantage of the Heaviside variant is that you can apply symbolic operation (e.g. derivative or integral) to it.
For completeness sake here is the variant using the programmed if-statement:
BTW, there is no need to define any vectors for x and y. Just plot the function and set the axis limits directly at the axis labeling (you can change the first, second and last value). I set the lowest value on the x-axis to 0.1 to match the picture and also dragged the y-axis to the right accordingly.
P6-worksheet attached
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