public static IDataset interpolate(IDataset oldx, IDataset oldy, IDataset newx) {
// TODO more sanity checks on inputs
DoubleDataset dx = (DoubleDataset) DatasetUtils.cast(oldx, Dataset.FLOAT64);
DoubleDataset dy = (DoubleDataset) DatasetUtils.cast(oldy, Dataset.FLOAT64);
boolean sorted = true;
double maxtest = oldx.getDouble(0);
for (int i = 1; i < ((Dataset) oldx).count(); i++) {
if (maxtest > oldx.getDouble(i)) {
sorted = false;
break;
}
maxtest = dx.getDouble(i);
}
double[] sortedx = null;
double[] sortedy = null;
if (!sorted) {
IntegerDataset sIdx = getIndiciesOfSorted(dx);
sortedx = new double[dx.getData().length];
sortedy = new double[dy.getData().length];
for (int i = 0; i < sIdx.getSize(); i++) {
sortedx[i] = dx.getDouble(sIdx.get(i));
sortedy[i] = dy.getDouble(sIdx.get(i));
}
} else {
sortedx = dx.getData();
sortedy = dy.getData();
}
SplineInterpolator si = new SplineInterpolator();
PolynomialSplineFunction poly = si.interpolate(sortedx, sortedy);
IDataset newy = newx.clone();
newy.setName(oldy.getName() + "_interpolated");
for (int i = 0; i < ((Dataset) newx).count(); i++) {
newy.set(poly.value(newx.getDouble(i)), i);
}
return newy;
}
@Override
public List<Dataset> integrate(IDataset dataset) {
// Generate radial and azimuthal look-up arrays as required
// TODO test shape of axis array
if (radialArray == null) {
generateRadialArray(dataset.getShape(), false);
}
if (azimuthalArray == null) {
generateMinMaxAzimuthalArray(
qSpace.getDetectorProperties().getBeamCentreCoords(), dataset.getShape());
}
Dataset mt = mask;
if (mask != null && !Arrays.equals(mask.getShape(), dataset.getShape()))
throw new IllegalArgumentException("Mask shape does not match dataset shape");
List<Dataset> result = new ArrayList<Dataset>();
if (binEdges == null) {
binEdges = calculateBins(radialArray, mt, radialRange, nbins);
binsChi = calculateBins(azimuthalArray, mt, azimuthalRange, nBinsChi);
}
final double[] edgesQ = binEdges.getData();
final double loQ = edgesQ[0];
final double hiQ = edgesQ[nbins];
final double spanQ = (hiQ - loQ) / nbins;
final double[] edgesChi = binsChi.getData();
final double loChi = edgesChi[0];
final double hiChi = edgesChi[nBinsChi];
final double spanChi = (hiChi - loChi) / nBinsChi;
FloatDataset histo = new FloatDataset(nBinsChi, nbins);
FloatDataset intensity = new FloatDataset(nBinsChi, nbins);
// final double[] h = histo.getData();
// final double[] in = intensity.getData();
// if (spanQ <= 0) {
// h[0] = ds.getSize();
// result.add(histo);
// result.add(bins);
// continue;
// }
Dataset a = DatasetUtils.convertToDataset(radialArray[0]);
Dataset b = DatasetUtils.convertToDataset(dataset);
// PositionIterator iter = b.getPositionIterator();
//
// int[] pos = iter.getPos();
// int[] posStop = pos.clone();
IndexIterator iter = a.getIterator();
while (iter.hasNext()) {
// posStop[0] = pos[0]+2;
// posStop[1] = pos[1]+2;
// Dataset qrange = a.getSlice(pos, posStop, null);
// Dataset chirange = azimuthalArray.getSlice(pos, posStop, null);
if (mt != null && !mt.getElementBooleanAbs(iter.index)) continue;
final double qMax = radialArray[1].getElementDoubleAbs(iter.index);
final double qMin = radialArray[0].getElementDoubleAbs(iter.index);
final double chiMax = azimuthalArray[1].getElementDoubleAbs(iter.index);
final double chiMin = azimuthalArray[0].getElementDoubleAbs(iter.index);
final double sig = b.getElementDoubleAbs(iter.index);
if (qMax < loQ || qMin > hiQ) {
continue;
}
if (chiMax < loChi || chiMin > hiChi) {
continue;
}
// losing something here? is flooring (int cast best?)
double minBinExactQ = (qMin - loQ) / spanQ;
double maxBinExactQ = (qMax - loQ) / spanQ;
int minBinQ = (int) minBinExactQ;
int maxBinQ = (int) maxBinExactQ;
double minBinExactChi = (chiMin - loChi) / spanChi;
double maxBinExactChi = (chiMax - loChi) / spanChi;
int minBinChi = (int) minBinExactChi;
int maxBinChi = (int) maxBinExactChi;
// FIXME potentially may need to deal with azimuthal arrays with discontinuities (+180/-180
// degress etc)
double iPerPixel = 1 / ((maxBinExactQ - minBinExactQ) * (maxBinExactChi - minBinExactChi));
double minFracQ = 1 - (minBinExactQ - minBinQ);
double maxFracQ = maxBinExactQ - maxBinQ;
double minFracChi = 1 - (minBinExactChi - minBinChi);
double maxFracChi = maxBinExactChi - maxBinChi;
for (int i = minBinQ; i <= maxBinQ; i++) {
if (i < 0 || i >= binEdges.getSize() - 1) continue;
for (int j = minBinChi; j <= maxBinChi; j++) {
if (j < 0 || j >= binsChi.getSize() - 1) continue;
int[] setPos = new int[] {j, i};
double val = histo.get(setPos);
double modify = 1;
if (i == minBinQ && minBinQ != maxBinQ) modify *= minFracQ;
if (i == maxBinQ && minBinQ != maxBinQ) modify *= maxFracQ;
if (i == minBinChi && minBinChi != maxBinChi) modify *= minFracChi;
if (i == maxBinChi && minBinChi != maxBinChi) modify *= maxFracChi;
histo.set(val + iPerPixel * modify, setPos);
double inVal = intensity.get(setPos);
intensity.set(inVal + sig * iPerPixel * modify, setPos);
}
}
}
processAndAddToResult(intensity, histo, result, radialRange, dataset.getName());
return result;
}