import type { array } from "../types";
/**
 * Linear interpolation.
 *
 * Linear interpolation. Returns the 1-D value of Y, given Xi query points.
 *
 * @param x sample points (must be sorted in ascending order)
 * @param y corresponding values of sample points
 * @param xnew new query points for interpolation
 * @return Interpolated values
 *
 * @example Interpolate at specific points
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * var x = [1,2,3,4,5,6];
 * var y = [2,4,6,8,10,12];
 * assertEquals(interp1(x,y,[2,4,6]), [4, 8, 12]);
 *
 * ```
 *
 * @example Interpolate at a single point
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * var x = [1,2,3,4,5,6];
 * var y = [2,4,6,8,10,12];
 *
 * assertEquals(interp1(x,y,3), 6);
 *
 * ```
 *
 * @example Interpolate between points
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * var x = [1,2,3,4,5,6];
 * var y = [2,4,6,8,10,12];
 *
 * assertEquals(interp1(x,y,3.5), 7);
 * ```
 */
export default function interp1(x: array, y: array, xnew: number | array): number | array;
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