[rrd-users] Re: PREV fails?

[Tobias Oetiker]

Tuesday you sent me mail regarding [rrd-users] PREV fails?:

*> Hi,
*> 
*> I was playing around a bit with scripts et al and it seems that I'm
*> doing something wrong while using PREV inside my CDEF script.
*> 
*> "active" is a datasource that counts seconds.  The number will vary
*> from 0 to about 21600.
*> 
*> I'm trying:
*>     CDEF:p=active,PREV,-
*>     AREA:p#0000FF:previous
*> (using either 1.0.8 or 1.0.9)
*> 
*> >From the manual I understand that this should:
*> 
*> 1) push the value of "active".
*> 2) push the previous value of ACTIVE or, if this is unknown, UNKN.
*> 3) subtract the second from the first, leaving one value on the stack.
*> 
*> Unfortunately the only value I get is UNKN and yes, I'm sure "active"
*> is not unknown for most of the time.

*> Where do I go wrong?

sonds fine to me ... I must say I have not tested the pREV funciton this was
contributed ... how about a 'demo script :-)' ... cheers
tobi
*> 
*> TIA
*> 

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