[rrd-users] Re: PREV fails?
oetiker at ee.ethz.ch
Mon Jan 3 11:02:18 MET 2000
Today you sent me mail regarding Re: [rrd-users] Re: PREV fails?:
*> Tobias Oetiker wrote:
*> > Today you sent me mail regarding Re: [rrd-users] Re: PREV fails?:
*> > *> Duh, it seems that the outcome of PREV is not related to the DS. It is related
*> > *> to the outcome of the previous CDEF value.
*> > *> I seem to have misunderstood the manual.
*> > *>
*> > *> Can somebody confirm this please?
*> > oops yes sure, because otherwhise which DS would PREV refer to ?
*> I tried something like:
*> In other words, I tried to work with the difference between the
*> previous value and the current one. Obviously, it doesn't work this way.
*> I'm sure I'll work around this sometime.
this will work, but you must guard against getting any unknowns in there ...
at first PREV will be UNKNOWN. This will propageat ...
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