[ncl-talk] dewtemp_trh function returns NaN values

[Mary Haley]

Hi Jon,

Thanks for letting us know about this issue.

I'm not sure what the correct behavior should be (a missing value, or an
outright error), but you're right that it shouldn't return NaN.

I've filed a ticket on this (NCL-2060) and will be sure to update the
documentation.

--Mary



On Fri, Sep 5, 2014 at 10:58 AM, Jon Meyer <jonathan.meyer at aggiemail.usu.edu
> wrote:

> Hello NCL developers,
>
> I wanted to bring a minor detail to your attention regarding the
> dewtemp_trh function. I've been using this function to compute dewpoint
> temperatures from WRF met_em files and have been seeing NaN values returned.
>
> Tracing this issue, I found that when RH values fall below 0%, the NaN
> values are returned. When I use the 'where' function to constrain all
> values to above 0%, the NaN values are not returned. Values above 100% do
> not return NaN values.
>
> I know from pervious email exchanges that functions are not supposed to
> return NaN values so I wanted to point this out.
>
> Since most met_em files have some values outside of the appropriate range
> due to interpolation biases, I figured either a warning message or a
> statement on the function's page would help others who are using this
> function avoid the NaNs, which seem to choke any plotting interface.
>
> Have a good day,
> Jon
>
>
>
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