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utilities.py
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utilities.py
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from __future__ import print_function, division
import numpy as np
# Kronecker's
#
# $$\ $$\ $$\
# $$ | $$ | $$ |
# $$$$$$$ | $$$$$$\ $$ |$$$$$$\ $$$$$$\
# $$ __$$ |$$ __$$\ $$ |\_$$ _| \____$$\
# $$ / $$ |$$$$$$$$ |$$ | $$ | $$$$$$$ |
# $$ | $$ |$$ ____|$$ | $$ |$$\ $$ __$$ |
# \$$$$$$$ |\$$$$$$$\ $$ | \$$$$ |\$$$$$$$ |
# \_______| \_______|\__| \____/ \_______|
def delta(a, b):
"""
Kronecker delta function
"""
return 1 if a == b else 0
# $$\
# \__|
# $$\ $$$$$$$\ $$$$$$\ $$$$$$\ $$$$$$\ $$$$$$\ $$\ $$\
# $$ |$$ _____| \____$$\ $$ __$$\ $$ __$$\ \____$$\ $$ | $$ |
# $$ |\$$$$$$\ $$$$$$$ |$$ | \__|$$ | \__|$$$$$$$ |$$ | $$ |
# $$ | \____$$\ $$ __$$ |$$ | $$ | $$ __$$ |$$ | $$ |
# $$ |$$$$$$$ |\$$$$$$$ |$$ | $$ | \$$$$$$$ |\$$$$$$$ |
# \__|\_______/ \_______|\__| \__| \_______| \____$$ |
# $$\ $$ |
# \$$$$$$ |
# \______/
def isarray(A):
"""
returns True if A is an array
"""
try:
if A.shape:
return True
else:
return False
except:
return False