# [rrd-users] Re: binary value

Gilles Lamiral lamiral at mail.dotcom.fr
Mon Mar 6 19:39:43 MET 2000

```alex at ergens.op.Het.Net wrote:

> An example is in place here.  Suppose you are monitoring the following
> values at the following times:

> What is going to happen?  During one interval, the value has been
> 0 for half of that interval and it has been 1 for the other half.
> This means that the average value will be 0.5 ...
>
> The minimum value will be 0, the maximum value will be 1.

I don't understand everything. Look at this:

rrdtool create bit.rrd --start 952210799    \
--step 300           \
DS:bit:GAUGE:300:0:1 \
RRA:AVERAGE:0:1:6    \
RRA:MAX:0:1:6    \
RRA:MIN:0:1:6    \
RRA:LAST:0:1:6

rrdtool update bit.rrd    952210800:1
rrdtool update bit.rrd    952210850:0
rrdtool update bit.rrd    952210900:0
rrdtool update bit.rrd    952210950:0
rrdtool update bit.rrd    952211000:0
rrdtool update bit.rrd    952211050:1
rrdtool update bit.rrd    952211100:1

rrdtool fetch bit.rrd AVERAGE --start 952210799 --end 952211400
bit

952210500:           NaN
952210800:          1.00
952211100:          0.33
952211400:           NaN

rrdtool fetch bit.rrd MAX --start 952210799 --end 952211400
bit

952210500:           NaN
952210800:          1.00
952211100:          0.33
952211400:           NaN

rrdtool fetch bit.rrd MIN --start 952210799 --end 952211400
bit

952210500:           NaN
952210800:          1.00
952211100:          0.33
952211400:           NaN

rrdtool fetch bit.rrd LAST --start 952210799 --end 952211400
bit

952210500:           NaN
952210800:          1.00
952211100:          0.33
952211400:           NaN

Everything is AVERAGE. Why ?

--
au revoir,
Gilles Lamiral. France, Rennes (35).

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```