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Check for extrapolation

This commit is contained in:
Lukas Klass 2020-04-14 11:17:21 +02:00
parent 7e16007ef8
commit 14ec3e2584
2 changed files with 60 additions and 15 deletions
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37
esbo_etc/classes/SpectralQty.py
View File

@ -3,6 +3,7 @@ from scipy.interpolate import interp1d
import astropy.units as u
import math
from typing import Union
import logging
class SpectralQty:
@ -10,7 +11,7 @@ class SpectralQty:
A class to hold and work with spectral quantities
"""
def __init__(self, wl: u.Quantity, qty: u.Quantity):
def __init__(self, wl: u.Quantity, qty: u.Quantity, extrapolate: bool = False):
"""
Initialize a new spectral quantity
@ -35,6 +36,7 @@ class SpectralQty:
self.qty = qty * u.dimensionless_unscaled
else:
error("Lengths not matching")
self._extrapolate = extrapolate
def __eq__(self, other) -> bool:
"""
@ -87,7 +89,13 @@ class SpectralQty:
return SpectralQty(self.wl, self.qty + other.qty)
# Wavelengths are not matching, rebinning needed
else:
return SpectralQty(self.wl, self.qty + other.rebin(self.wl).qty)
# Rebin addend
other_rebinned = other.rebin(self.wl)
if len(self.wl) == len(other_rebinned.wl) and all(self.wl == other_rebinned.wl):
return SpectralQty(self.wl, self.qty + other_rebinned.qty)
else:
# Wavelengths are still not matching as extrapolation is disabled, rebin this spectral quantity
return SpectralQty(other_rebinned.wl, self.rebin(other_rebinned.wl).qty + other_rebinned.qty)
else:
error("Units are not matching for addition.")
@ -125,7 +133,13 @@ class SpectralQty:
return SpectralQty(self.wl, self.qty - other.qty)
# Wavelengths are not matching, rebinning needed
else:
return SpectralQty(self.wl, self.qty - other.rebin(self.wl).qty)
# Rebin subtrahend
other_rebinned = other.rebin(self.wl)
if len(self.wl) == len(other_rebinned.wl) and all(self.wl == other_rebinned.wl):
return SpectralQty(self.wl, self.qty - other_rebinned.qty)
else:
# Wavelengths are still not matching as extrapolation is disabled, rebin this spectral quantity
return SpectralQty(other_rebinned.wl, self.rebin(other_rebinned.wl).qty - other_rebinned.qty)
else:
error("Units are not matching for substraction.")
@ -155,7 +169,13 @@ class SpectralQty:
return SpectralQty(self.wl, self.qty * other.qty)
# Wavelengths are not matching, rebinning needed
else:
return SpectralQty(self.wl, self.qty * other.rebin(self.wl).qty)
# Rebin factor
other_rebinned = other.rebin(self.wl)
if len(self.wl) == len(other_rebinned.wl) and all(self.wl == other_rebinned.wl):
return SpectralQty(self.wl, self.qty * other_rebinned.qty)
else:
# Wavelengths are still not matching as extrapolation is disabled, rebin this spectral quantity
return SpectralQty(other_rebinned.wl, self.rebin(other_rebinned.wl).qty * other_rebinned.qty)
else:
error("Units are not matching for multiplication.")
@ -179,5 +199,10 @@ class SpectralQty:
if wl.unit != self.wl.unit:
error("Mismatching units for rebinning: " + wl.unit + ", " + self.wl.unit)
f = interp1d(self.wl, self.qty, fill_value="extrapolate")
return SpectralQty(wl, f(wl) * self.qty.unit)
if not self._extrapolate:
if min(wl) < min(self.wl) or max(wl) > max(self.wl):
logging.warning("Extrapolation disabled, bandwidth will be reduced.")
# Remove new wavelengths where extrapolation would have been necessary
wl = [x.value for x in wl if min(self.wl) <= x <= max(self.wl)] * wl.unit
f = interp1d(self.wl, self.qty.value, fill_value="extrapolate")
return SpectralQty(wl, f(wl.to(self.wl.unit)) * self.qty.unit)

38
tests/test_SpectralQty.py
View File

@ -31,9 +31,14 @@ class TestSpectralQty(TestCase):
SpectralQty(self.wl, [1.1, 2.4, 3.9, 5.6] << u.W / (u.m * u.nm)))
self.assertEqual(SpectralQty(self.wl, np.arange(1, 5, 1) << u.m) * self.sqty,
SpectralQty(self.wl, [1.1, 2.4, 3.9, 5.6] << u.W / (u.m * u.nm)))
# rebin
self.assertEqual(self.sqty * SpectralQty(np.arange(200.5, 204.5, 1) << u.nm, np.arange(1, 5, 1) << u.m),
SpectralQty(self.wl, [0.55, 1.8, 3.25, 4.9] << u.W / (u.m * u.nm)))
# rebin without extrapolation and without reduction
self.assertEqual(
self.sqty * SpectralQty(np.arange(199.5, 204.5, 1) << u.nm, np.arange(1, 6, 1) << u.m),
SpectralQty(self.wl, [1.65, 3.0, 4.55, 6.3] * u.W / (u.m * u.nm)))
# rebin without extrapolation and with reduction
self.assertEqual(
self.sqty * SpectralQty(np.arange(200.5, 204.5, 1) << u.nm, np.arange(1, 5, 1) << u.m),
SpectralQty(range(201, 204) << u.nm, [1.8, 3.25, 4.9] << u.W / (u.m * u.nm)))
def test___sub__(self):
# Quantity
@ -44,10 +49,14 @@ class TestSpectralQty(TestCase):
self.assertEqual(
self.sqty - SpectralQty(np.arange(200, 204, 1) << u.nm, np.arange(1, 5, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [0.1, -0.8, -1.7, -2.6] * u.W / (u.m ** 2 * u.nm)))
# rebin
# rebin without extrapolation and without reduction
self.assertEqual(
self.sqty - SpectralQty(np.arange(199.5, 204.5, 1) << u.nm, np.arange(1, 6, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [-0.4, -1.3, -2.2, -3.1] * u.W / (u.m ** 2 * u.nm)))
# rebin without extrapolation and with reduction
self.assertEqual(
self.sqty - SpectralQty(np.arange(200.5, 204.5, 1) << u.nm, np.arange(1, 5, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [0.6, -0.3, -1.2, -2.1] * u.W / (u.m ** 2 * u.nm)))
SpectralQty(range(201, 204) << u.nm, [-0.3, -1.2, -2.1] << u.W / (u.m ** 2 * u.nm)))
def test___add__(self):
# Quantity
@ -58,22 +67,33 @@ class TestSpectralQty(TestCase):
self.assertEqual(
self.sqty + SpectralQty(np.arange(200, 204, 1) << u.nm, np.arange(1, 5, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [2.1, 3.2, 4.3, 5.4] * u.W / (u.m ** 2 * u.nm)))
# rebin
# rebin without extrapolation and without reduction
self.assertEqual(
self.sqty + SpectralQty(np.arange(199.5, 204.5, 1) << u.nm, np.arange(1, 6, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [2.6, 3.7, 4.8, 5.9] * u.W / (u.m ** 2 * u.nm)))
# rebin without extrapolation and with reduction
self.assertEqual(
self.sqty + SpectralQty(np.arange(200.5, 204.5, 1) << u.nm, np.arange(1, 5, 1) << u.W / (u.m ** 2 * u.nm)),
SpectralQty(self.wl, [1.6, 2.7, 3.8, 4.9] * u.W / (u.m ** 2 * u.nm)))
SpectralQty(range(201, 204) << u.nm, [2.7, 3.8, 4.9] << u.W / (u.m ** 2 * u.nm)))
def test_rebinning(self):
# Test interpolation
wl_new = np.arange(200.5, 210.5, 1) << u.nm
sqty_res = SpectralQty(wl_new[:3], [1.15, 1.25, 1.35] << u.W / (u.m ** 2 * u.nm))
sqty_rebin = self.sqty.rebin(wl_new)
self.assertEqual(sqty_rebin, sqty_res)
# Test extrapolation
wl_new = np.arange(200.5, 210.5, 1) << u.nm
sqty_res = SpectralQty(wl_new, [1.15, 1.25, 1.35, 1.45, 1.55, 1.65, 1.75, 1.85,
1.95, 2.05] << u.W / (u.m ** 2 * u.nm))
sqty_rebin = self.sqty.rebin(wl_new)
sqty_extrapol = SpectralQty(self.wl, self.qty, extrapolate=True)
sqty_rebin = sqty_extrapol.rebin(wl_new)
self.assertEqual(sqty_rebin, sqty_res)
# Test binning
self.setUp()
wl_new = np.arange(200.5, 210, 2) << u.nm
sqty_res = SpectralQty(wl_new, [1.15, 1.35, 1.55, 1.75, 1.95] << u.W / (u.m ** 2 * u.nm))
sqty_res = SpectralQty(wl_new[:2], [1.15, 1.35] << u.W / (u.m ** 2 * u.nm))
sqty_rebin = self.sqty.rebin(wl_new)
self.assertEqual(sqty_rebin, sqty_res)