59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
##
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# This software was developed and / or modified by Raytheon Company,
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# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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#
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# U.S. EXPORT CONTROLLED TECHNICAL DATA
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# This software product contains export-restricted data whose
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# export/transfer/disclosure is restricted by U.S. law. Dissemination
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# to non-U.S. persons whether in the United States or abroad requires
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# an export license or other authorization.
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#
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# Contractor Name: Raytheon Company
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# Contractor Address: 6825 Pine Street, Suite 340
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# Mail Stop B8
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# Omaha, NE 68106
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# 402.291.0100
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#
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# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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# further licensing information.
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###
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## @file Derivative.py
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from numpy.ma.core import masked_greater
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from numpy.ma.core import masked_values
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from numpy.ma.core import filled
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import Vector
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##
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# Calculate the derivative of A with respect to B.
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#
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# @param A0: Initial value of A
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# @type A0: numpy array
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# @param A1: Final value of A
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# @type A0: numpy array
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# @param B0: Initial value of B
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# @type A0: numpy array
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# @param B1: Final value of B
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# @type A0: numpy array
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# @return: The derivative of A with respect to B
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# @rtype: numpy array
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def execute(A0, A1, B0, B1):
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"Calculate the derivative of A with respect to B."
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if isinstance(A0, tuple):
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# Do derivitive of components of the vector
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u0 = A0[2]
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v0 = A0[3]
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u1 = A1[2]
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v1 = A1[3]
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uDeriv = execute(u0, u1, B0, B1)
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vDeriv = execute(v0, v1, B0, B1)
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return Vector.execute(uDeriv, vDeriv)
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Adiff = A1-A0
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Bdiff = B1-B0
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result = Adiff / Bdiff
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return result
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