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#!/usr/bin/env python3
# Copyright 2019-2021 Yinjian Zhao
#
# This file is part of WarpX.
#
# License: BSD-3-Clause-LBNL
# This script tests the collision module in RZ.
# Electrons are set with the same vr,
# and thus particles are traveling locally in the same direction.
# Physically, the collision rate should therefore be very low.
# Thus the initial electron momentum will be compared with the final momentum.
# Possible errors:
# tolerance: 1.0e-30
# Possible running time: ~ 1.0 s
from glob import glob
import os
import sys
import numpy as np
import yt
sys.path.insert(1, '../../../../warpx/Regression/Checksum/')
import checksumAPI
tolerance = 1.0e-15
last_fn = sys.argv[1]
if (last_fn[-1] == "/"): last_fn = last_fn[:-1]
fn_list = glob(last_fn[:-5] + "?????")
for fn in fn_list:
# get time index j
j = int(fn[-5:])
if j==0:
# load file
ds = yt.load( fn )
ad = ds.all_data()
px1 = ad['particle_momentum_x'].to_ndarray()
py1 = ad['particle_momentum_y'].to_ndarray()
if j==150:
# load file
ds = yt.load( fn )
ad = ds.all_data()
px2 = ad['particle_momentum_x'].to_ndarray()
py2 = ad['particle_momentum_y'].to_ndarray()
error = np.max( abs(px1-px2)+abs(py1-py2) )
print('error = ', error)
print('tolerance = ', tolerance)
assert(error < tolerance)
test_name = os.path.split(os.getcwd())[1]
checksumAPI.evaluate_checksum(test_name, fn, do_particles=False)
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