A Step function () is a sharp transition from 0 to some other value (amplitude) at some location (a certain time, for example). Create a single step function with a certain amplitude from an initial level to a final level at a start location. The step function is a function of one variable (the time t, for example). The default Function name is step1.

Enter a Location (s0) of the step. The value of the step function is the initial level for input values that are smaller than the location of the step. In the From field, enter a start level (Lstart ). In the To field, enter a final level (Lend). For an input variable s, a start location s0, and initial level Lstart and a final level Lend, the step function’s value is Lstart for s < s0 and Lend for s ≥ s0. The amplitude of the step is Lend −  Lstart.