[rrd-users] Re: problems summing many sources together

[Fabien Wernli]

On Wed, Jun 07, 2006 at 05:26:08PM +0200, Georges Toth wrote:
> Which "looks" fine if all the soruces contain data.
> But if some sources don't contain data, I just get NAN.

you need to add an IF directive there which returns data or zero if undefined:

| CDEF:mycdef=mydef,UN,0,mydef,IF

which yields in your case

| CDEF:mycdef=mydef00,UN,0,mydef00,IF,
|             mydef01,UN,0,mydef01,IF,
| [...]
|             mydef99,UN,0,mydef99,IF,
|             +,
|             +,
| [...]
|             +
             

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