78 lines
3.4 KiB
JavaScript
78 lines
3.4 KiB
JavaScript
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defineSuite([
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'Core/HermitePolynomialApproximation'
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], function(
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HermitePolynomialApproximation) {
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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,
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13374128.3576279, 0,
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13362104.8328212, 0,
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13342073.6310691, 0,
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13314046.7567223, 0,
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13278041.0057990, 0,
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13234077.9559193, 0,
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13182183.9533740, 0
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];
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var dyTable = [
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0.000000000000, 0,
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-133.614738921601, 0,
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-267.149404854867, 0,
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-400.523972797808, 0,
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-533.658513692378, 0,
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-666.473242324565, 0,
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-798.888565138278, 0,
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-930.825127934390, 0
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];
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var yTableCombined = new Array(yTable.length * 2);
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for ( var i = 0; i < yTable.length / 2; ++i) {
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yTableCombined[i * 4 + 0] = yTable[i * 2 + 0];
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yTableCombined[i * 4 + 1] = yTable[i * 2 + 1];
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yTableCombined[i * 4 + 2] = dyTable[i * 2 + 0];
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yTableCombined[i * 4 + 3] = dyTable[i * 2 + 1];
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}
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var x = 100.0;
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it('interpolating produces correct results.', function() {
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// Since we want a zero order calculation we need to switch to a yStride of 4.
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var result = HermitePolynomialApproximation.interpolateOrderZero(x, xTable, yTableCombined, 4);
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var expectedResult = 13367002.870928625;
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//The accuracy is lower because we are no longer using derivative info
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expect(result[0]).toEqualEpsilon(expectedResult, 1e-6);
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});
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it('interpolating produces correct results with a result parameter.', function() {
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// Since we want a zero order calculation we need to switch to a yStride of 4.
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var result = new Array(4);
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var returnedResult = HermitePolynomialApproximation.interpolateOrderZero(x, xTable, yTableCombined, 4, result);
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var expectedResult = 13367002.870928625;
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expect(result).toBe(returnedResult);
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//The accuracy is lower because we are no longer using derivative info
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expect(result[0]).toEqualEpsilon(expectedResult, 1e-6);
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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(HermitePolynomialApproximation.getRequiredDataPoints(0)).toEqual(2);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(1)).toEqual(2);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(2)).toEqual(3);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(3)).toEqual(4);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(3, 1)).toEqual(2);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(5, 1)).toEqual(3);
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expect(HermitePolynomialApproximation.getRequiredDataPoints(7, 1)).toEqual(4);
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});
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it('higher order interpolation produces correct results.', function() {
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var result = HermitePolynomialApproximation.interpolate(x, xTable, yTableCombined, 2, 1, 1);
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var expectedResult = [13367002.870928625, 0.0, -222.65168787012135, 0.0];
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expect(result).toEqualEpsilon(expectedResult, 1e-8);
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});
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});
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