Re: [rrd-users] RPN Confusion

Simone Felici ha scritto:
> Hi!
>
> Ok, maybe discussed into archives, but I cannot find any solution.
> Now I want to understood the RPN syntax to write my own graph with different colors.
> I'm at this point... trying to determinate a stack value.
>
> in example, changing color every 20 units.
> The first CDEF is ok (0-20), it's an area:
>
> C1=ds,20,GE,20,ds,IF
> also if ds>20 then C1=20, else C1=ds. And this goes to AREA
> Until here, OK!
>
> The second will be a stack (20-40).
> if ds>40, then C2=20, elseif ds>20 then C2=ds-20 else C2=0
>
> The last it's a stack too:
> if ds>lastvaluelimit, then Cn=ds-lastvaluelimit, else Cn=0
>
> I cannot write it into RPN, have no idea how to set elseif and make operations to variables only in the else case.
> I've read the tutorial, it's not discussed how use multiple IF
>
>
> Please :(
>
>

Solved.... sorry for the mail ;)

middle stack:
C2=d,40,GE,20,d,20,GE,d,20,-,0,IF,IF

The lasta stack it's ok too:
Cn=ds,lastvaluelimit,GE,ds,lastvaluelimit,-,0,IF

Now I've to check eventually UNKN values ;)

Byebye

Happy!
Simon


--
Simone Felici E-Mail: s.felici@alpikom.it
Divisione Tecnica Tel: 0461 030 111
Alpikom S.p.A. Fax: 0461 030 112
v.Fersina, 23 - 38100 Trento URL: http://www.alpikom.it

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