> Is it possible to have a weighted average like eg. 0.5 val[t]+0.3
> val[t-1]+0.2 val[t-2] ?
Kind of, I use (val[t-1] - val[t]) * 0.93 + val[t].
I think I stole it from this list once.
By changing the weight factor 0.93, you can change how slow the line
responds.
Together with some catching of exceptions, it becomes something like:
DEF:val=/rrd/bla/..
CDEF:avg=PREV,UN,val,UN,1,val,IF,PREV,IF,val,UN,1,val,IF,-,0.93,*,val,UN
,1,val,IF,+
LINE1:val
LINE1:avg
So PREV has been replaced with:
IF (PREV=UN) {
val
} else {
PREV
}
and val has been replaced with:
IF (val==UN){
1
} else {
val
}
Serge.
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