Hi, Thanks for both the suggestions but I opted to use the following as I found it simpler.
> CDEF:c=a,b,ADDNAN > VDEF:total=c,TOTAL I thought this would be easier to understand if I came back and looked at my code. Thanks, Chris _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
