I'm working on a presentation in which I will be mentioning functions of the form
$s_i(x) = \begin{cases}|x - x_i|, & |x - x_i| < 1 \\ 0, &\text{otherwise}\end{cases}$
Basically, it's a single peak of a triangle wave, centered on some given value $x_i$. Does anyone know if there's a standard name for this sort of function?
For anyone who's interested, the use case is a program that computes the discrete values
$f_i = \int s_i(x)f(x)\mathrm{d}x$
for several functions, and then uses them for various numerical computations on the functions $f$. I'm not writing the program (that's been done), just analyzing it, and I'd like to be able to know what keywords to use to look up more information if/when I need it.