def test_source_component_arbitrary_grid():
ui = Session()
model = Const1D('c')
model.c0 = 10
def tst(x, y, re_x, yy):
ui.load_arrays(1, x, y)
regrid_model = model.regrid(re_x)
ui.plot_source_component(regrid_model)
numpy.testing.assert_array_equal(ui._compsrcplot.x, x)
numpy.testing.assert_array_almost_equal(ui._compsrcplot.y, yy)
x = [1, 2, 3]
y = [1, 2, 3]
re_x = [10, 20, 30]
tst(x, y, re_x, [0, 0, 0])
x = numpy.linspace(1, 10, 10)
y = x
re_x = numpy.linspace(5, 15, 15)
tst(x, y, re_x, [0, 0, 0, 0, 10, 10, 10, 10, 10, 10])
re_x = numpy.linspace(1, 5, 15)
tst(x, y, re_x, [10, 10, 10, 10, 10, 0, 0, 0, 0, 0])
re_x = numpy.linspace(3, 5, 15)
tst(x, y, re_x, [0, 0, 10, 10, 10, 0, 0, 0, 0, 0])
def test_source_component_arbitrary_grid_int():
from sherpa.astro.ui.utils import Session
from sherpa.models import Const1D
from sherpa.data import Data1DInt
ui = Session()
x = numpy.array([1, 2, 3]), numpy.array([2, 3, 4])
y = [1.5, 2.5, 3.5]
re_x = numpy.array([10, 20, 30]), numpy.array([20, 30, 40])
ui.load_arrays(1, x[0], x[1], y, Data1DInt)
model = Const1D('c')
model.c0 = 10
regrid_model = model.regrid(*re_x)
with pytest.warns(UserWarning):
ui.plot_source_component(regrid_model)
x_points = (x[0] + x[1]) / 2
re_x_points = (re_x[0] + re_x[1]) / 2
points = numpy.concatenate((x_points, re_x_points))
numpy.testing.assert_array_equal(ui._compsrcplot.x, points)
numpy.testing.assert_array_equal(ui._compsrcplot.y,
[10, 10, 10, 100, 100, 100])
def calc_wstat_sherpa(mu_sig, n_on, n_off, alpha):
import sherpa.stats as ss
from sherpa.astro.data import DataPHA
from sherpa.models import Const1D
wstat = ss.WStat()
model = Const1D()
model.c0 = mu_sig
data = DataPHA(counts=np.atleast_1d(n_on),
name='dummy',
channel=np.atleast_1d(1),
backscal=1,
exposure=1)
background = DataPHA(counts=np.atleast_1d(n_off),
name='dummy background',
channel=np.atleast_1d(1),
backscal=np.atleast_1d(1. / alpha),
exposure=1)
data.set_background(background, 1)
# Docstring for ``calc_stat``
# https://github.com/sherpa/sherpa/blob/fe8508818662346cb6d9050ba676e23318e747dd/sherpa/stats/__init__.py#L219
stat = wstat.calc_stat(model=model, data=data)
print("Sherpa stat: {}".format(stat[0]))
print("Sherpa fvec: {}".format(stat[1]))
def setup():
const = Const1D("const")
const.c0 = 0
const.c0.freeze()
my_model = MyModel("my_model")
my_model.integrate = False
return Session(), my_model, const
def test_zero_division_calc_stat():
ui = Session()
x = numpy.arange(100)
y = numpy.zeros(100)
ui.load_arrays(1, x, y, DataPHA)
ui.group_counts(1, 100)
ui.set_full_model(1, Const1D("const"))
# in principle I wouldn't need to call calc_stat_info(), I could just
# use _get_stat_info to reproduce the issue, However, _get_stat_info is not a public
# method, so I want to double check that calc_stat_info does not throw an exception.
# So, first we try to run calc_stat_info and make sure there are no exceptions.
# Then, since calc_stat_info only logs something and doesn't return anything, we use
# a white box approach to get the result from _get_stat_info.
ui.calc_stat_info()
assert ui._get_stat_info()[0].rstat is numpy.nan
def test_source_component_arbitrary_grid_int():
ui = Session()
x = numpy.array([1, 2, 3]), numpy.array([2, 3, 4])
y = [1.5, 2.5, 3.5]
re_x = numpy.array([10, 20, 30]), numpy.array([20, 30, 40])
ui.load_arrays(1, x[0], x[1], y, Data1DInt)
model = Const1D('c')
model.c0 = 10
regrid_model = model.regrid(*re_x)
ui.plot_source_component(regrid_model)
x_points = (x[0] + x[1]) / 2.0
numpy.testing.assert_array_equal(ui._compsrcplot.x, x_points)
numpy.testing.assert_array_equal(ui._compsrcplot.y, [0., 0., 0.])
def test_plot_model_arbitrary_grid_integrated():
ui = Session()
x = [1, 2, 3], [2, 3, 4]
y = [1, 2, 3]
re_x = [10, 20, 30], [20, 30, 40]
ui.load_arrays(1, x[0], x[1], y, Data1DInt)
model = Const1D('c')
model.c0 = 10
regrid_model = model.regrid(*re_x)
ui.set_model(regrid_model)
with pytest.warns(UserWarning):
ui.plot_model()
numpy.testing.assert_array_equal(ui._modelplot.x, [1.5, 2.5, 3.5])
numpy.testing.assert_array_equal(ui._modelplot.y, [10, 10, 10])
def test_source_component_arbitrary_grid():
ui = Session()
x = [1, 2, 3]
y = [1, 2, 3]
re_x = [10, 20, 30]
ui.load_arrays(1, x, y)
model = Const1D('c')
model.c0 = 10
regrid_model = model.regrid(re_x)
with pytest.warns(UserWarning):
ui.plot_source_component(regrid_model)
numpy.testing.assert_array_equal(ui._compsrcplot.x, x + re_x)
numpy.testing.assert_array_equal(ui._compsrcplot.y, [
10,
] * 6)
def setup(make_data_path):
from sherpa.astro.io import read_pha
from sherpa.astro import xspec
infile = make_data_path("9774.pi")
data = read_pha(infile)
data.notice(0.3, 7.0)
# Change the exposure time to make the fitted amplitude
# > 1
#
data.exposure = 1
# Use the wabs model because it is unlikely to change
# (as scientifically it is no-longer useful). The problem
# with using something like the phabs model is that
# changes to that model in XSPEC could change the results
# here.
#
# We fit the log of the nH since this makes the numbers
# a bit closer to O(1), and so checking should be easier.
#
abs1 = xspec.XSwabs('abs1')
p1 = PowLaw1D('p1')
factor = Const1D('factor')
factor.integrate = False
model = abs1 * p1 + 0 * factor
factor.c0 = 0
abs1.nh = 10**factor.c0
# Ensure the nh limits are honoured by factor (upper limit only).
# If you don't do this then the fit can fail because a value
# outside the abs1.nh but within factor.c0 can be picked.
#
factor.c0.max = numpy.log10(abs1.nh.max)
rsp = Response1D(data)
return {'data': data, 'model': rsp(model)}
def test_zero_case():
"""Check what happens when values can be near -1. See #740"""
xs = np.arange(1, 6)
ys = np.asarray([0.5, -0.5, 0.3, 0.2, -0.1])
dyl = np.asarray([2, 2, 2, 2, 2])
dyh = np.asarray([2, 2, 2, 2, 2])
data = Data1DAsymmetricErrs('zero', xs, ys, dyl, dyh)
mdl = Const1D('flat')
bestfit = Fit(data, mdl).fit()
rd = ReSampleData(data, mdl)
# Both approaches should give the same results (as setting
# niter explicitly).
#
# res = rd.call(niter=10, seed=47)
res = rd(niter=10, seed=47)
# Technically this depends on random chance, but it is rather
# unlikely we'd get 10 -1 values here. Relax the -1 value and
# just ensure we have more than 1 unique value here (can probably
# assert nvs == 10 but technically we allow repeated values).
#
vs = np.unique(res['flat.c0'])
nvs = len(vs)
assert nvs > 1
# Minimal testing of the other return values. We do assume that
# we have not found a better fit than the fit.
#
samples = res['samples']
stats = res['statistic']
assert samples.shape == (10, 5)
assert stats.shape == (10, )
assert (stats >= bestfit.statval).all()
def test_fake_pha_background_pha(reset_seed):
"""Sample from background pha"""
np.random.seed(1234)
data = DataPHA("any", channels, counts, exposure=1000.)
bkg = DataPHA("bkg", channels, bcounts, exposure=2000, backscal=2.5)
data.set_background(bkg, id="used-bkg")
data.set_arf(arf)
data.set_rmf(rmf)
mdl = Const1D("mdl")
mdl.c0 = 0
# Just make sure that the model does not contribute
fake_pha(data, mdl, is_source=True, add_bkgs=False)
assert data.counts.sum() == 0
fake_pha(data, mdl, is_source=True, add_bkgs=True)
# expected is [200, 200, 200]
assert data.counts.sum() > 400
assert data.counts.sum() < 1000
# Add several more backgrounds. Actual background should be average.
# We add 5 background with half the exposure time as this first oned
# and essentially 0 counts. So, we should find 1/11 of the counts
# we found in the last run.
for i in range(5):
bkg = DataPHA("bkg",
channels,
np.ones(3, dtype=np.int16),
exposure=1000,
backscal=2.5)
data.set_background(bkg, id=i)
fake_pha(data, mdl, is_source=True, add_bkgs=True)
# expected is about [18, 18, 18]
assert data.counts.sum() > 10
assert data.counts.sum() < 200
def get_data(mu_sig, n_on, n_off, alpha):
from sherpa.astro.data import DataPHA
from sherpa.models import Const1D
model = Const1D()
model.c0 = mu_sig
data = DataPHA(
counts=np.atleast_1d(n_on),
name="dummy",
channel=np.atleast_1d(1),
backscal=1,
exposure=1,
)
background = DataPHA(
counts=np.atleast_1d(n_off),
name="dummy background",
channel=np.atleast_1d(1),
backscal=np.atleast_1d(1. / alpha),
exposure=1,
)
data.set_background(background, 1)
return model, data
def test_plot_model_arbitrary_grid_integrated():
ui = Session()
model = Const1D('c')
model.c0 = 10
def tst(x, y, re_x, yy):
ui.load_arrays(1, x[0], x[1], y, Data1DInt)
regrid_model = model.regrid(*re_x)
ui.set_model(regrid_model)
ui.plot_model()
avg_x = 0.5 * (x[0] + x[1])
numpy.testing.assert_array_equal(ui._modelplot.x, avg_x)
numpy.testing.assert_array_almost_equal(ui._modelplot.y, yy)
tmp = numpy.arange(1, 5, 1)
x = tmp[:-1], tmp[1:]
y = x[0]
tmp = numpy.arange(10, 50, 10)
re_x = tmp[:-1], tmp[1:]
tst(x, y, re_x, [0, 0, 0])
tmp = numpy.arange(1, 20, 1)
x = tmp[:-1], tmp[1:]
y = x[0]
tmp = numpy.arange(1, 20, 0.5)
re_x = tmp[:-1], tmp[1:]
tst(x, y, re_x, len(y) * [10])
tmp = numpy.arange(1, 20, 1)
x = tmp[:-1], tmp[1:]
y = x[0]
tmp = numpy.arange(10, 20, 0.5)
re_x = tmp[:-1], tmp[1:]
n = int(len(y) / 2)
yy = numpy.append(n * [0.], n * [10.])
tst(x, y, re_x, yy)
def test_fake_pha_basic(has_bkg, is_source, reset_seed):
"""No background.
See also test_fake_pha_add_background
For simplicity we use perfect responses.
A background dataset can be added, but it should
not be used in the simulation with default settings
"""
np.random.seed(4276)
data = DataPHA("any", channels, counts, exposure=1000.)
if has_bkg:
bkg = DataPHA("bkg", channels, bcounts, exposure=2000, backscal=0.4)
data.set_background(bkg, id="unused-bkg")
data.set_arf(arf)
data.set_rmf(rmf)
mdl = Const1D("mdl")
mdl.c0 = 2
fake_pha(data, mdl, is_source=is_source, add_bkgs=False)
assert data.exposure == pytest.approx(1000.0)
assert (data.channel == channels).all()
assert data.name == "any"
assert data.get_arf().name == "user-arf"
assert data.get_rmf().name == "delta-rmf"
if has_bkg:
assert data.background_ids == ["unused-bkg"]
bkg = data.get_background("unused-bkg")
assert bkg.name == "bkg"
assert bkg.counts == pytest.approx(bcounts)
assert bkg.exposure == pytest.approx(2000)
else:
assert data.background_ids == []
if is_source:
# check we've faked counts (the scaling is such that it is
# very improbable that this condition will fail)
assert (data.counts > counts).all()
# For reference the predicted source signal is
# [200, 400, 400]
#
# What we'd like to say is that the predicted counts are
# similar, but this is not easy to do. What we can try
# is summing the counts (to average over the randomness)
# and then a simple check
#
assert data.counts.sum() > 500
assert data.counts.sum() < 1500
# This is more likely to fail by chance, but still very unlikely
assert data.counts[1] > data.counts[0]
else:
# No multiplication with exposure time, arf binning, etc.
# so we just expect very few counts
assert data.counts.sum() < 10
assert data.counts.sum() >= 2
# Essentially double the exposure by having two identical arfs
data.set_arf(arf, 2)
data.set_rmf(rmf, 2)
fake_pha(data, mdl, is_source=is_source, add_bkgs=False)
if is_source:
assert data.counts.sum() > 1200
assert data.counts.sum() < 3000
assert data.counts[1] > data.counts[0]
else:
assert data.counts.sum() < 20
assert data.counts.sum() >= 4
def test_fake_pha_bkg_model(reset_seed):
"""Test background model
"""
np.random.seed(5329853)
data = DataPHA("any", channels, counts, exposure=1000.)
bkg = DataPHA("bkg", channels, bcounts, exposure=2000, backscal=1.)
data.set_background(bkg, id="used-bkg")
data.set_arf(arf)
data.set_rmf(rmf)
bkg.set_arf(arf)
bkg.set_rmf(rmf)
mdl = Const1D("mdl")
mdl.c0 = 0
bmdl = Const1D("bmdl")
bmdl.c0 = 2
# With no background model the simulated source counts
# are 0.
#
fake_pha(data,
mdl,
is_source=True,
add_bkgs=False,
bkg_models={"used-bkg": bmdl})
assert data.counts == pytest.approx([0, 0, 0])
# Check we have created source counts this time.
#
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={"used-bkg": bmdl})
assert data.exposure == pytest.approx(1000.0)
assert (data.channel == channels).all()
assert data.name == "any"
assert data.get_arf().name == "user-arf"
assert data.get_rmf().name == "delta-rmf"
# The background itself is unchanged
assert data.background_ids == ["used-bkg"]
bkg = data.get_background("used-bkg")
assert bkg.name == "bkg"
assert bkg.counts == pytest.approx(bcounts)
assert bkg.exposure == pytest.approx(2000)
# Apply a number of regression checks to test the output. These
# can expect to change if the randomization changes (either
# explicitly or implicity). There used to be a number of checks
# that compares the simulated data to the input values, but these
# could occasionally fail, and so the seed was fixed for these
# tests.
#
# For reference the predicted signal is
# [200, 400, 400]
# but, unlike in the test above, this time it's all coming
# from the background.
#
assert data.counts == pytest.approx([186, 411, 405])
# Now add a second set of arf/rmf for the data.
# However, all the signal is background, so this does not change
# any of the results.
data.set_arf(arf, 2)
data.set_rmf(rmf, 2)
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={"used-bkg": bmdl})
assert data.counts == pytest.approx([197, 396, 389])
def test_fake_pha_has_valid_ogip_keywords_all_fake(tmp_path, reset_seed):
"""See #1209
When everything is faked, what happens?
"""
np.random.seed(5)
data = DataPHA("any", channels, counts, exposure=1000.)
bkg = DataPHA("bkg", channels, bcounts, exposure=2000, backscal=1.)
data.set_background(bkg, id="used-bkg")
data.set_arf(arf)
data.set_rmf(rmf)
bkg.set_arf(arf)
bkg.set_rmf(rmf)
mdl = Const1D("mdl")
mdl.c0 = 0
bmdl = Const1D("bmdl")
bmdl.c0 = 2
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={"used-bkg": bmdl})
outfile = tmp_path / "sim.pha"
io.write_pha(str(outfile), data, ascii=False)
inpha = io.read_pha(str(outfile))
assert inpha.channel == pytest.approx(channels)
# it is not required that we check counts (that is, we can drop this
# if it turns out not to be repeatable across platforms), but for
# now keep the check.
#
assert inpha.counts == pytest.approx([188, 399, 416])
for field in [
"staterror", "syserror", "bin_lo", "bin_hi", "grouping", "quality"
]:
assert getattr(inpha, field) is None
assert inpha.exposure == pytest.approx(1000.0)
assert inpha.backscal == pytest.approx(1.0)
assert inpha.areascal == pytest.approx(1.0)
assert not inpha.grouped
assert not inpha.subtracted
assert inpha.response_ids == []
assert inpha.background_ids == []
hdr = inpha.header
assert hdr["TELESCOP"] == "none"
assert hdr["INSTRUME"] == "none"
assert hdr["FILTER"] == "none"
for key in [
"EXPOSURE", "AREASCAL", "BACKSCAL", "ANCRFILE", "BACKFILE",
"RESPFILE"
]:
assert key not in hdr
def test_fake_pha_has_valid_ogip_keywords_from_real(make_data_path, tmp_path,
reset_seed):
"""See #1209
In this version we use a "real" PHA file as the base.
See sherpa/astro/ui/tests/test_astro_ui_utils_simulation.py
test_fake_pha_issue_1209
which is closer to the reported case in #1209
"""
np.random.seed(5)
infile = make_data_path("acisf01575_001N001_r0085_pha3.fits.gz")
data = io.read_pha(infile)
mdl = Const1D("mdl")
mdl.c0 = 0
bmdl = Const1D("bmdl")
bmdl.c0 = 2
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={"used-bkg": bmdl})
outfile = tmp_path / "sim.pha"
io.write_pha(str(outfile), data, ascii=False)
inpha = io.read_pha(str(outfile))
assert inpha.channel == pytest.approx(np.arange(1, 1025))
# it is not required that we check counts (that is, we can drop this
# if it turns out not to be repeatable across platforms), but for
# now keep the check.
#
assert inpha.counts.sum() == 19
for field in [
"staterror", "syserror", "bin_lo", "bin_hi", "grouping", "quality"
]:
assert getattr(inpha, field) is None
assert inpha.exposure == pytest.approx(37664.157219191)
assert inpha.backscal == pytest.approx(2.2426552620567e-06)
assert inpha.areascal == pytest.approx(1.0)
assert not inpha.grouped
assert not inpha.subtracted
assert inpha.response_ids == []
assert inpha.background_ids == []
hdr = inpha.header
assert hdr["TELESCOP"] == "CHANDRA"
assert hdr["INSTRUME"] == "ACIS"
assert hdr["FILTER"] == "none"
for key in [
"EXPOSURE", "AREASCAL", "BACKSCAL", "ANCRFILE", "BACKFILE",
"RESPFILE"
]:
assert key not in hdr
def test_fake_pha_bkg_model():
"""Test background model
"""
data = DataPHA('any', channels, counts, exposure=1000.)
bkg = DataPHA('bkg', channels, bcounts, exposure=2000, backscal=1.)
data.set_background(bkg, id='used-bkg')
data.set_arf(arf)
data.set_rmf(rmf)
bkg.set_arf(arf)
bkg.set_rmf(rmf)
mdl = Const1D('mdl')
mdl.c0 = 0
bmdl = Const1D('bmdl')
bmdl.c0 = 2
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={'used-bkg': bmdl})
assert data.exposure == pytest.approx(1000.0)
assert (data.channel == channels).all()
assert data.name == 'any'
assert data.get_arf().name == 'user-arf'
assert data.get_rmf().name == 'delta-rmf'
# The background itself is unchanged
assert data.background_ids == ['used-bkg']
bkg = data.get_background('used-bkg')
assert bkg.name == 'bkg'
assert bkg.counts == pytest.approx(bcounts)
assert bkg.exposure == pytest.approx(2000)
# check we've faked counts (the scaling is such that it is
# very improbable that this condition will fail)
assert (data.counts > counts).all()
# For reference the predicted signal is
# [200, 400, 400]
# but, unlike in the test above, this time it's all coming
# from the background.
#
# What we'd like to say is that the predicted counts are
# similar, but this is not easy to do. What we can try
# is summing the counts (to average over the randomness)
# and then a simple check
#
assert data.counts.sum() > 500
assert data.counts.sum() < 1500
# This is more likely to fail by chance, but still very unlikely
assert data.counts[1] > 1.5 * data.counts[0]
# Now add a second set of arf/rmf for the data.
# However, all the signal is background, so this does not change
# any of the results.
data.set_arf(arf, 2)
data.set_rmf(rmf, 2)
fake_pha(data,
mdl,
is_source=True,
add_bkgs=True,
bkg_models={'used-bkg': bmdl})
assert data.counts.sum() > 500
assert data.counts.sum() < 1500
assert data.counts[1] > 1.5 * data.counts[0]
