A Triangle function () is a linear increase and linear decline within an interval and 0 everywhere else. You can use the triangle function for band-pass filtering, for example; that is, use it to select values within an interval. The triangle function is a function of one variable (the time t, for example). The default Function name is tri1.

Enter a Lower limit (the default is −0.5) and Upper limit (the default is 0.5) to specify the interval for the triangle function. For example, if the input argument is time, enter a start and end time. In the midpoint of the interval, this function evaluates to 1, and moving toward the interval boundaries it falls off to 0. Outside the interval it evaluates to 0.