Takes an array of [x, y] pairs and a curve value for all break points. x values can be negative (for use in indexing with negative values or signals). See InterplEnv Help for more info.
a = InterplPairs([[0, 1], [1, 2], [2, 0]], \sin);a.plot;a = InterplPairs([[-1, 1], [0, 2], [1, 0]], \sin);a.plot;a.at(-0.5);a.at(0.2);