-------- Original Message --------
Subject: Re: [rrd-users] Re: Calculating average when aggregating
Date: Mon, 05 Aug 2002 15:26:11 +0200
From: Stephan Harren <[EMAIL PROTECTED]>
To: Geert van der Ploeg <[EMAIL PROTECTED]>
References: <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]>
> What is your way of averaging?
> We should be able to determine what the outcome should be, following the
> calculation.
>
>
> If the average does not start at the beginning and doesn't do the
> calculation right, a (nasty) solution would be to change the UNKNOWN
value
> to the value of the 'known' DS.
> Thus, you get an average which is equal to the only known DS, as long
as the
> other, UNKNOWN DS is unknown.
> That would be something like: ds1,UN,ds0,ds1,IF (where ds1 is the
unkwown,
> newest DS, and ds0 the DS that started 6 months ago)
>
>
WOW, cool! But as you said, nasty. Anyway, this is not very handy if
you've got twelve datasources ...
O.K., my way of averaging would be like:
DS1 DS2 AGGREGATED
Timestamp1:
20 NaN 20
Timestamp2:
10 NaN 10
Timestamp3:
20 10 30
Sum of the three timestamps is 60 so the average should be 20
If the Print-Command behaves like the graphing it will look like this:
DS1 DS2 AGGREGATED
Timestamp1:
20 NaN NaN
Timestamp2:
10 NaN NaN
Timestamp3:
20 10 30
There is only one valid timestmp, so the average will be 30.
Have you ever tried this ?
Best regards,
Stephan
--
Stephan Harren
Manager Site Operations
MFN-IS Germany
Tel 0049 69 90554 153
Cell
0049 173 7011126
Fax
0049 69 90554 111
--
Stephan Harren
Manager Site Operations
MFN-IS Germany
Tel 0049 69 90554 153
Cell
0049 173 7011126
Fax
0049 69 90554 111
--
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