e2ecdcfe33
Former-commit-id:a02aeb236c[formerly9f19e3f712] [formerlya02aeb236c[formerly9f19e3f712] [formerly06a8b51d6d[formerly 64fa9254b946eae7e61bbc3f513b7c3696c4f54f]]] Former-commit-id:06a8b51d6dFormer-commit-id:8e80217e59[formerly3360eb6c5f] Former-commit-id:377dcd10b9
54 lines
1.7 KiB
Python
54 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 IsenStability.py
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from numpy import NaN
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from numpy import isnan
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from numpy import maximum
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from numpy import shape
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##
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# Calculate the isentropic stability through a layer.
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#
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# @param p_up: Pressure on upper isentrope (mb)
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# @param p_lo: Pressure on lower isentrope (mb)
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# @param o_up: Upper isentrope (K)
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# @param o_lo: This (lower) isentrope (K)
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# @return: Isentropic stability array through layer
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# @rtype: numpy array
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def execute(p_up, p_lo, o_up, o_lo):
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"Calculate the isentropic stability through a layer."
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# protect against divide-by-zero errors
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o_diff = o_up - o_lo
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dth = 1.0 / o_diff
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# calculate stability [maximum() is elementwise]
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p_diff = p_lo-p_up
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stab = maximum(p_diff, 10.0) * dth
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# maximum(NaN,X) is X. Restore the NaNs.
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if shape(p_diff) == ():
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if isnan(p_diff):
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stab = NaN
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else:
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stab[isnan(p_diff)] = NaN
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return stab
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