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#!/usr/bin/env python
"""Compare the output from SEP against SExtractor."""
from __future__ import print_function
import sys
def read_table(fname):
"""
Read in a whitespace-separated table.
Parameters
----------
fname : path-like
The filename of the table to be opened.
Returns
-------
List[List[int|float]]
A list of rows, each of which is a list of the values in that row.
"""
rows = []
for line in open(fname, "r"):
l = line.strip()
if len(l) == 0 or l[0] == "#":
continue
items = l.split()
typed_items = []
for it in items:
try:
typed_items.append(int(it))
except ValueError:
typed_items.append(float(it))
rows.append(typed_items)
return rows
def fracdiff(x, y):
"""
Return the fraction difference between two numbers.
Parameters
----------
x, y : float
The numbers to be compared.
Returns
-------
float
The fractional difference.
"""
return abs((y - x) / max(y, x))
if __name__ == "__main__":
fname1, fname2 = sys.argv[1:3]
ref = read_table(fname1)
sep = read_table(fname2)
# sort by y coordinate
ref.sort(key=lambda row: row[2])
sep.sort(key=lambda row: row[2])
assert len(ref) == len(sep)
for i in range(len(ref)):
assert abs(ref[i][1] - sep[i][1] - 1.0) < 1.0e-3 # x coordinate
assert abs(ref[i][2] - sep[i][2] - 1.0) < 1.0e-3 # y coordinate
assert fracdiff(ref[i][12], sep[i][3]) < 2.0e-4 # flux
print("compare passed")
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