[rrd-users] php rrdgraph

[Martin Hoppe]

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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