[rrd-users] Re: Adding more DEF/CDEFs to graph

[Tobias Oetiker]

Today you sent me mail regarding Re: [rrd-users] Adding more DEF/CDEFs to graph:

*> I get it.  That is one thing that I did not think of!  Thanks for the
*> explanation.  So even if there are no datapoints before  1999-08-17
*> 01:15:00 GMT for this archive there isn't a way to fix this because no
*> datapoint is an *UNKOWN*?  Could I possibly do a global replace of the
*> NaN with '0' in this one archive and then the sum would include 0 not
*> *UNKOWN*?  Otherwise if there are no possible solutions the explantion
*> is satisfactory.

you can replace NaN by 0 on the fly ... doing CDEF:z=x,UN,x,0,IF

or something like this ... 

cheers
tobi

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