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| import { LagrangePolynomialApproximation } from "../../Source/Cesium.js";
|
| describe("Core/LagrangePolynomialApproximation", function () {
| //The results of these specs were validated against STK Components
| //an aerospace SDK available from Analytical Graphics. www.agi.com/components/
|
| var xTable = [0, 60, 120, 180, 240, 300, 360, 420];
| var yTable = [
| 13378137.0,
| 0.0,
| 0,
| 13374128.3576279,
| 327475.593690065,
| 0,
| 13362104.8328212,
| 654754.936954423,
| 0,
| 13342073.6310691,
| 981641.896976832,
| 0,
| 13314046.7567223,
| 1307940.57608951,
| 0,
| 13278041.005799,
| 1633455.42917117,
| 0,
| 13234077.9559193,
| 1957991.38083385,
| 0,
| 13182183.953374,
| 2281353.94232816,
| 0,
| ];
|
| var x = 100.0;
|
| it("interpolation produces correct results.", function () {
| var result = LagrangePolynomialApproximation.interpolateOrderZero(
| x,
| xTable,
| yTable,
| 3
| );
| var expectedResult = [13367002.870928623, 545695.7388100647, 0];
| expect(result).toEqualEpsilon(expectedResult, 1e-15);
| });
|
| it("interpolation produces correct results with a result parameter", function () {
| var result = new Array(3);
| var returnedResult = LagrangePolynomialApproximation.interpolateOrderZero(
| x,
| xTable,
| yTable,
| 3,
| result
| );
| var expectedResult = [13367002.870928623, 545695.7388100647, 0];
| expect(result).toBe(returnedResult);
| expect(result).toEqualEpsilon(expectedResult, 1e-15);
| });
|
| it("getRequiredDataPoints should be 1 more than degree, except for 0, which requires 2", function () {
| expect(LagrangePolynomialApproximation.getRequiredDataPoints(0)).toEqual(2);
| expect(LagrangePolynomialApproximation.getRequiredDataPoints(1)).toEqual(2);
| expect(LagrangePolynomialApproximation.getRequiredDataPoints(2)).toEqual(3);
| expect(LagrangePolynomialApproximation.getRequiredDataPoints(3)).toEqual(4);
| });
| });
|
|
