[rrd-developers] opposite of unknaszero

[lists at ripper.informatik.uni-ulm.de]

Hi!

[I'm not sure if rrd-developers is the right place but I think I'll reach
 the right persons and there is more traffic on rrd-users ;-)  ]

Some time ago there was a thread about how get the "unknaszero" semantics
with rrdtool (to stack some values). Now I wonder if I could get the
"opposite" behaviour as known from mrtg. I'll explain:

The goal:
mrtg repeats the last value from the log for following unknown values. You
can suppress this with "Options[..]: unknaszero". As I try to simulate mrtg
with 14all (btw: thx alex for promoting it so much ;-) I would like to get
the first behaviour too (the second is trivial with rrdtool).

The problem:
I don't know a way to do this with rrdtool.
I didn't found an option like "unknaslast" ...
I wanted to try "ds0,UN,last(ds0),ds0,IF" but there's no such function.

Any ideas? It think it's hard to realize (make the stack "persistent" to
save the last value on it, a second stack to push old values on ...)


Rainer
-- 
Rainer.Bawidamann at informatik.uni-ulm.de

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