awips2/cave/com.raytheon.uf.viz.derivparam.python/localization/derivedParameters/functions/Magnitude.py
root e2ecdcfe33 Initial revision of AWIPS2 11.9.0-7p5
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Python

##
# This software was developed and / or modified by Raytheon Company,
# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
#
# U.S. EXPORT CONTROLLED TECHNICAL DATA
# This software product contains export-restricted data whose
# export/transfer/disclosure is restricted by U.S. law. Dissemination
# to non-U.S. persons whether in the United States or abroad requires
# an export license or other authorization.
#
# Contractor Name: Raytheon Company
# Contractor Address: 6825 Pine Street, Suite 340
# Mail Stop B8
# Omaha, NE 68106
# 402.291.0100
#
# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
# further licensing information.
##
# ----------------------------------------------------------------
# Calculate magnitude
# ----------------------------------------------------------------
from numpy import hypot
def execute(*args):
""" Return the magnitude of a given vector or vector components
"""
if type(args[0]) == tuple:
return vectorMagnitude(args[0])
else:
return componentMagnitude(args[0], args[1])
def vectorMagnitude(vector):
""" Return the first item in the vector tuple (its the magnitude)
vector tuples are assumed to follow the tuple returned by the
Vector.execute method. That is (mag,dir,u,v)
"""
return vector[0]
def componentMagnitude(u, v):
return hypot(u, v)
def test():
from Vector import execute as Vector
from numpy import array
testVector = Vector(array([1., 2.]), array([180., 270.]), True)
result = execute(testVector)
if not(all(result == array([1.,2.]))):
raise Exception
result = execute(testVector[2],testVector[3])
if not(all(result == array([1.,2.]))):
raise Exception
print "Magnitude Test Complete"