Re: Using a windowed counter

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Uh... my bad, I miss-read the details. You are right, it's a rainfall per
hour rate.

I think a pre-filter script to convert your hourly rate back into a counter
before feeding it to rrd would be the best option. A little python
scripting would probably do it pretty easily.

On 14 June 2017 at 09:07, Alex van den Bogaerdt <[email protected]>
wrote:

> > A far simpler solution is; it's just a counter that resets every hour.
>
> No it's not.
>
> >> > 011111244445678888889998767777765555553444335888889899987677
> >> > 010000120001121000121000012000110000010100012300011010001210
>                   ------------
>                    ------------
>
> Look approximately halfway:  98767
> Then look below: 00012
>
> The "counter" goes from 7 to 6, as a result of rainfall 1 being added and
> 2 being removed from the window.
>
> If you treat this as a counter being reset every hour, you would get
> negative rainfall, or counter overflow with the resulting huge flood, or
> rates becoming unknown because of sanity checks.
>
>
>
>
>
>


-- 
Donovan Baarda <[email protected]>

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<div dir=3D"ltr">Uh... my bad, I miss-read the details. You are right, it&#=
39;s a rainfall per hour rate.<div><br></div><div>I think a pre-filter scri=
pt to convert your hourly rate back into a counter before feeding it to rrd=
 would be the best option. A little python scripting would probably do it p=
retty easily.</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On 14 June 2017 at 09:07, Alex van den Bogaerdt <span dir=3D"ltr">&=
lt;<a href=3D"mailto:[email protected]" target=3D"_blank">alex@vandenb=
ogaerdt.nl</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span cl=
ass=3D"">&gt; A far simpler solution is; it&#39;s just a counter that reset=
s every hour.<br>
<br>
</span>No it&#39;s not.<br>
<br>
&gt;&gt; &gt; 011111244445678888889998767777<wbr>76555555344433588888989998=
7677<br>
&gt;&gt; &gt; 010000120001121000121000012000<wbr>11000001010001230001101000=
1210<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0------=
------<br>
<br>
Look approximately halfway:=C2=A0 98767<br>
Then look below: 00012<br>
<br>
The &quot;counter&quot; goes from 7 to 6, as a result of rainfall 1 being a=
dded and<br>
2 being removed from the window.<br>
<br>
If you treat this as a counter being reset every hour, you would get<br>
negative rainfall, or counter overflow with the resulting huge flood, or<br=
>
rates becoming unknown because of sanity checks.<br>
<br>
<br>
<br>
<br>
<br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature">Donovan Baarda &lt;=
<a href=3D"mailto:[email protected]" target=3D"_blank">abo@minkirri=
.apana.org.au</a>&gt;</div>
</div>

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