[rrd-users] logarithm and negative values

[Carsten Aulbert]

Hi,

R Dicaire wrote:
> Hi folks, in playing with the logarithm option for graphing, I notice
> all my 'outbound' values (CDEF'd as b=a,-1,*) dont appear at all when
> using -o arg to rrdtool graph. Have I missed something here?
> 

without looking too much: Usually negative values and logarithms don't
go together well. If you still want them (mirrored) you should use the
absolute value.

http://en.wikipedia.org/wiki/Logarithm

HTH

Carsten