21.1.1  Boxcar function

The boxcar command creates a function which has the value 1 in a given interval, and otherwise 0.

• boxcar takes three arguments:
  • a,b, two real numbers.
  • x, an identifier or expression.
• boxcar(a,b,x) returns θ(x−a)−θ(x−b), where θ is the Heaviside function (see Section 7.3.9). The resulting expression defines a function which is zero everywhere except within the segment [a,b], where its value is equal to 1.

Examples