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DRAFT TO DISCUSS: Add support and testing for equivalent units #571

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[ 50 character, one line summary ]

[ Description of the changes in this commit. It should be enough
information for someone not following this development to understand.
Lines should be wrapped at about 72 characters. ]

User interface changes?: [ No/Yes ]
[ If yes, describe what changed, and steps taken to ensure backward compatibilty ]

Fixes: [Github issue #s] And brief description of each issue.

Testing:
test removed:
unit tests:
system tests:
manual testing:

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That was quick!
This looks good to me.

@@ -176,3 +176,14 @@ def W_m_minus_2__to__erg_cm_minus_2_s_minus_1():
def erg_cm_minus_2_s_minus_1__to__W_m_minus_2():
"""Convert erg per square centimeter and second to Watt per square meter"""
return '1.0E-3{kind}*{var}'

##################
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I don't know what this is called in the DSM-5 but I really want a couple of more hash marks here :)
I know where to get some cheap :)

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This is not going to work with prebuild (at least the way the PR is written now). The unit conversions above return

def erg_cm_minus_2_s_minus_1__to__W_m_minus_2():
    """Convert erg per square centimeter and second to Watt per square meter"""
    return '1.0E-3{kind}*{var}'

in other words, they contain the input variable in the result string. I think you need to make similar changes to the ccpp_prebuild logic (if None then skip the unit conversion altogether), or you may get an error in the Python code, or in the auto-generated Fortran code.

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Yeah, I didn't add this to prebuild yet.
If we agree on this for Capgen, then I could add it in to Prebuild as part of this PR.

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@gold2718 Nothing is cheap in Norway, not even hashes from what I hear :)
And now I know what DSM-5 is.
(I will add some more hashes in for prettiness)

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Nothing is cheap in Norway, not even hashes from what I hear :)

That's what a harrytur* is for.

*Harrytur: Norwegian slang for driving to Sweden to buy stuff that's cheaper there.

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@dustinswales The easiest way (no changes at all in prebuild) would be to return just the input variable in the conversion string ({var}) for equivalent units, not None. If a compiler finds foo=foo in the fortran code, it is very likely going to optimize out that line anyway.

@@ -176,3 +176,14 @@ def W_m_minus_2__to__erg_cm_minus_2_s_minus_1():
def erg_cm_minus_2_s_minus_1__to__W_m_minus_2():
"""Convert erg per square centimeter and second to Watt per square meter"""
return '1.0E-3{kind}*{var}'

##################
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This is not going to work with prebuild (at least the way the PR is written now). The unit conversions above return

def erg_cm_minus_2_s_minus_1__to__W_m_minus_2():
    """Convert erg per square centimeter and second to Watt per square meter"""
    return '1.0E-3{kind}*{var}'

in other words, they contain the input variable in the result string. I think you need to make similar changes to the ccpp_prebuild logic (if None then skip the unit conversion altogether), or you may get an error in the Python code, or in the auto-generated Fortran code.

##################
# Equivalent units #
##################
def m2_s_minus_2__to__J_kg_minus_1():
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Just checking, does a unit string of m2 s-1 in the metadata files correspond to m2_s_minus_2 or m_2_s_minus_2 or m_plus_2_s_minus_2?

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3 participants