[rrd-users] [GRAYMAIL] RE: Re: Re: RE: RE: Question about trend line

[rseiwert]

Wait I actually sent an email with some crazy calculation to get it. There is a vdef function called stepwidth but I think u need to be on a latest version of rrd

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From: Ondrej [via RRD Mailinglists]<mailto:ml-node+s937164n7583100h51 at n2.nabble.com>
Sent: ‎8/‎14/‎2015 5:06 PM
To: Robert C. Seiwert<mailto:rob at vcaglobal.com>
Subject: [GRAYMAIL] RE: Re: Re: RE: RE: Question about trend line

I somehow ended up with desired output and used your way for equation for getting a number a process it in CDEF to get the final line.

CDEF:trend=dt_month,POP,$COEF,COUNT,* \

$COEF is my final previously calculated number that is close to "24" when you print it, but I still have doubts about that number.  How to get "step width" that you mentioned? Playing with numbers I found that "19500" as step width, gives proper line direction, but gives me no clue why 19500. This is rather match question but I would still appreciate your comment on that.
thanks

[http://rrd-mailinglists.937164.n2.nabble.com/file/n7583100/trend3_rrd.png]

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