Re: SV: Humidity Calculation Error and Fix v 1.59

[Martin G. <gim...@gi...>]

"Funder, Johnny                  OTP" <jh...@NA...> writes:

> Hi,
> 
> For your information, the official formular looks like this:
> 
>                   1779,75 (Td - Tt)
> RH = ANTILOG ( --------------------------   + 2 )
>                (237,3 + Td) ( 237.3 + Tt)
> 
> where Tt = temperature and Td = dewpoint (of course)
> 
> This is how my code looks like in Fortran 77 (for what it's worth)
> 
> 
>         TAELLER = (DEWPOINT-TEMPERATURE)*1779.75
>         NAEVNER = (237.3+DEWPOINT)*(237.3+TEMPERATURE)
>         LOG10_VAL = ((TAELLER/NAEVNER)+2)
>         BASE = 10
>         CONSTANT = LOG(BASE)
>         R_HUMIDITY = EXP(LOG10_VAL * CONSTANT)
> 
> It should be very easy to convert that to php.

Very nice - I'll update the tarballs accordingly, just as soon at I
hear about my attempts at implementing extract and str_replace in
PHP3-friendly code.

By the way: I've been thinking about putting the old-but-working code
into CVS at Sourceforge. It seams that people are using v 1.59 and are
happy about it, so we should make it easy for ourselves to fix things
in that source-tree as well.

Is there anybody here who has experience with branches in CVS? I've
only used CVS for PHP Weather, but I think that we should do a branch
here, so that we could have the stable and unstable code in CVS at the
same time.

I know that we could also just make a directory called 'old' or
something like that, but it doesn't sound like the correct way to do
things with CVS.

-- 
Martin Geisler                       My GnuPG Key: 0xF7F6B57B

See my homepage at http://www.gimpster.com/ for:
PHP Weather => Shows the current weather on your webpage.
PHP Shell   => A telnet-connection (almost :-) in a PHP page.