class:: InterplPairs
summary:: envelope specification
related:: Classes/InterplEnv
categories:: Control, Envelopes

description::
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 link::Classes/InterplEnv:: Help for more info.

Examples::

code::
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);
::
