cc: [email protected]
Subject: Re: [ast-users] NaN and their payloads
--------
> I'm currently looking into a complex mathematical simulation (fluid
> dynamics) and found references to NaN (Not A Number) with payloads.
> The Nan values are used to represent 'no data' in the datasets and the
> payloads are used for context information. The code has almost 2
> million lines of code and removing the feature would be a major
> effort.
Mathematical simulation in fluid dynamics is my old field.
I got my PhD work on transonic airflow.
I don't know why you mean by NaN payloads. Currently NaN is a long double
constant, but you can do
typeset -sE x=NaN
to get a float NaN.
>
> As we are in the process of using ksh93 as "interface" to the
> simulation using libshell we need access to Nan values and their
> payloads.
>
> Can anyone give an estimate how hard it would be to add support for
> Nan payloads to ksh93?
>
>
David Korn
[email protected]
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