45 lines
2.0 KiB
JavaScript
45 lines
2.0 KiB
JavaScript
defineSuite([
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'Core/LagrangePolynomialApproximation'
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], function(
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LagrangePolynomialApproximation) {
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'use strict';
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//The results of these specs were validated against STK Components
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//an aerospace SDK available from Analytical Graphics. www.agi.com/components/
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var xTable = [0, 60, 120, 180, 240, 300, 360, 420];
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var yTable = [
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13378137.0000000, 0.000000000, 0,
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13374128.3576279, 327475.593690065, 0,
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13362104.8328212, 654754.936954423, 0,
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13342073.6310691, 981641.896976832, 0,
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13314046.7567223, 1307940.576089510, 0,
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13278041.0057990, 1633455.429171170, 0,
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13234077.9559193, 1957991.380833850, 0,
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13182183.9533740, 2281353.942328160, 0
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];
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var x = 100.0;
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it('interpolation produces correct results.', function() {
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var result = LagrangePolynomialApproximation.interpolateOrderZero(x, xTable, yTable, 3);
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var expectedResult = [13367002.870928623, 545695.7388100647, 0];
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expect(result).toEqualEpsilon(expectedResult, 1e-15);
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});
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it('interpolation produces correct results with a result parameter', function() {
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var result = new Array(3);
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var returnedResult = LagrangePolynomialApproximation.interpolateOrderZero(x, xTable, yTable, 3, result);
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var expectedResult = [13367002.870928623, 545695.7388100647, 0];
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expect(result).toBe(returnedResult);
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expect(result).toEqualEpsilon(expectedResult, 1e-15);
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});
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it('getRequiredDataPoints should be 1 more than degree, except for 0, which requires 2', function() {
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expect(LagrangePolynomialApproximation.getRequiredDataPoints(0)).toEqual(2);
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expect(LagrangePolynomialApproximation.getRequiredDataPoints(1)).toEqual(2);
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expect(LagrangePolynomialApproximation.getRequiredDataPoints(2)).toEqual(3);
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expect(LagrangePolynomialApproximation.getRequiredDataPoints(3)).toEqual(4);
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});
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});
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