Method testPercentile

tests/analysis/smooth/SmoothTest.cpp:21–65

// ##############################################################################

void SmoothTest::testPercentile() {
	// data
	QVector<int> xData{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
	QVector<double> yData{47.7, 44., 43., 44.96, 45., 43.73, 38., 47.1, 44., 38.3};
	// p=0.5, d=5	(check with LibreOffice and Origin 2020a)
	QVector<double> result50_5{47.7, 44, 44.96, 44, 43.73, 44.96, 44, 43.73, 44, 38.3};

	// data source columns
	Column xDataColumn(QStringLiteral("x"), AbstractColumn::ColumnMode::Integer);
	xDataColumn.replaceInteger(0, xData);

	Column yDataColumn(QStringLiteral("y"), AbstractColumn::ColumnMode::Double);
	yDataColumn.replaceValues(0, yData);

	XYSmoothCurve smoothCurve(QStringLiteral("smooth"));
	smoothCurve.setXDataColumn(&xDataColumn);
	smoothCurve.setYDataColumn(&yDataColumn);

	// prepare the smooth
	XYSmoothCurve::SmoothData smoothData = smoothCurve.smoothData();
	smoothData.type = nsl_smooth_type_percentile;
	// default
	// smoothData.points = 5;
	// smoothData.percentile = 0.5;
	smoothCurve.setSmoothData(smoothData);

	// perform the smooth
	smoothCurve.recalculate();
	const auto& smoothResult = smoothCurve.result();

	// check the results
	QCOMPARE(smoothResult.available, true);
	QCOMPARE(smoothResult.valid, true);

	const auto* resultXDataColumn{smoothCurve.xColumn()};
	const auto* resultYDataColumn{smoothCurve.yColumn()};

	const int np{resultXDataColumn->rowCount()};
	QCOMPARE(np, 10);

	for (int i = 0; i < np; i++) {
		QCOMPARE(resultXDataColumn->valueAt(i), (double)i + 1);
		QCOMPARE(resultYDataColumn->valueAt(i), result50_5.at(i));
	}
}

QTEST_MAIN(SmoothTest)