Define a Curve with the Curve Calculator
Curves can be defined mathematically using the curve calculator.

Type an expressions directly into the vector field or enter it by clicking
selected numbers, functions, or operators on the curve calculator.
Note: The curve calculator is formatted much like a scientific calculator. It consists of a number pad, basic algebraic and trigonometric functions, and curve fitting, filtering, and signalprocessing functions.
 Once the expression is constructed, click Apply to plot the curve.