[rrd-users] Re: Problem with max when summing two values

[Alex van den Bogaerdt]

On Wed, Jul 16, 2003 at 04:22:59PM -0400, Erik A. Dahl wrote:

> max:41.44M
> max:21.64M
> max:21.97M
> 
> 21.64 + 21.97 = 43.61 != 41.44
> 
> Any thoughts?  I have moved the end time back before the last poll so 
> that my DEFs aren't getting the last unknown value.

There's no reason to assume the peaks occured at the same time, hence
you cannot sum them and expect the total to be at 43.61


range1:   1,2,3,4,5,6,7      max==7
range2:   7,6,5,4,3,2,1      max==7
----------------------- sum
          8,8,8,8,8,8,8      max==8


max(range1)+max(range2) == 14 != 8

HTH
Alex
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