[rrd-users] Re: CDEF question

[Alex van den Bogaerdt]

Christian Pearce wrote:
> 
> if I added in a CDEF stay
> z=a,b,+
> 
> if a is nan will that make the whole expression nan? If so is there an
> easy way to make this zero besides using RPN with IF statements?

1)Yes
2)No, but what is so difficult about:  a,UN,0,a,IF ?

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