[RegCNET] (no subject)

[Graziano Giuliani]

On 06/14/2012 08:56 AM, csun at atmos.umd.edu wrote:
> Dear friend,
>
> I find that you fixed the FPE problem in the code.Could you please tell me
> what dose the FPE stands for?
> Thank you very much!
>
> Sincerely,
> Sun Chao
[...]

I am using the same term used by the operating system, FPE stands for Floating 
Point Exception, Enabling all debug flags, gfortran compiler instruments the 
code to catch expressions which are IEEE754 valid calculations but which may 
lead to so called denormalized numbers. For example,

exp(-250)

is to be considered "almost" zero, but is represented in a denormalized format 
(floating point underflow)
.
Refer to http://en.wikipedia.org/wiki/Floating_point as reference.

Normally You shouldn't care about this, but as long as floating point arithmetic 
may be tricky, we prefer to use "good" numbers.

BTW, we have identified the first July as the deadline for the release of RegCM 4.3!

Ciao!

Graziano.

-- 
Graziano Giuliani - Earth System Physics Section
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera, 11 - I - 34151 Trieste Italy