[rrd-users] [rrd-users]Re: php rrdgraph

[Martin Hoppe]

Thanks for your answer,

but "^" is not supported.
I get the following error message: invalid rpn expression in:
windspeed,.694,^,1.102,*

Did somebody knows the correct expression?

Martin

-----Ursprüngliche Nachricht-----
Von: MrPaul [mailto:mrpaular at gmail.com] 
Gesendet: Dienstag, 30. Mai 2006 22:39
An: Martin Hoppe
Betreff: Re: [rrd-users] php rrdgraph

Replying off list as I'm not positive of my answer but maybe it'll get you
started enough to fix it if it's wrong.

DEF:windspeed_ms=windspeed.rrd:windspeed:AVERAGE
CDEF:windspeed_bft=windspeed_ms,.694,^,1.102,*
LINE2:windspeed_ms
LINE2:windspeed_bft

I'm not sure if "^" is supported.

Good Luck,
Paul

On 5/30/06, Martin Hoppe <martin.hoppe at nordwind-ev.de> wrote:
> Hi,
> I want to calculate the windspeed from m/s in beaufort before I draw 
> the graph.
> The equation is: windspeed [bft] = (windspeed [m/s] ^ 0.694)*1.102
>
> This is the php-code: $windspeed_bft = pow($windspeed_ms,0.694)*1.102;
>
> But how can I write this with php-rrdgraph?
>
>     CDEF: ???
>
> Best regards
>
> Martin
>
>
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