private static Dataset ifft2d(final Dataset a, final int[] s, final int[] axes) {
Dataset result = null;
Dataset dest = null;
PositionIterator pi;
int[] pos;
boolean[] hit;
switch (a.getDtype()) {
case Dataset.FLOAT32:
case Dataset.COMPLEX64:
FloatFFT_2D ffft = new FloatFFT_2D(s[0], s[1]);
float[] fdata = null;
result = new ComplexFloatDataset(newShape(a.getShapeRef(), s, axes));
dest = new ComplexFloatDataset(s);
fdata = (float[]) dest.getBuffer();
pi = a.getPositionIterator(axes);
pos = pi.getPos();
hit = pi.getOmit();
while (pi.hasNext()) {
Arrays.fill(fdata, 0.f);
a.copyItemsFromAxes(pos, hit, dest);
ffft.complexInverse(fdata, true);
result.setItemsOnAxes(pos, hit, fdata);
}
break;
case Dataset.FLOAT64:
case Dataset.COMPLEX128:
DoubleFFT_2D dfft = new DoubleFFT_2D(s[0], s[1]);
double[] ddata = null;
result = new ComplexDoubleDataset(newShape(a.getShapeRef(), s, axes));
dest = new ComplexDoubleDataset(s);
ddata = (double[]) dest.getBuffer();
pi = a.getPositionIterator(axes);
pos = pi.getPos();
hit = pi.getOmit();
while (pi.hasNext()) {
Arrays.fill(ddata, 0.);
a.copyItemsFromAxes(pos, hit, dest);
dfft.complexInverse(ddata, true);
result.setItemsOnAxes(pos, hit, ddata);
}
break;
default:
logger.warn("Non-float dataset not yet supported");
break;
}
return result;
}