findInterval

import mir.ndslice.allocation: rcslice;
import mir.ndslice.topology: as;
import mir.ndslice.slice: sliced;
import mir.interpolate.linear;

static immutable x = [0.0, 1, 2];
static immutable y = [10.0, 2, 4];
auto interpolation = linear!double(x.rcslice, y.as!(const double).rcslice);
assert(interpolation.findInterval(1.0) == 1);