[rrd-users] Math functions in RRD-graph

[Edwin Nadorp]

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Hello,

Ik am using RRDtool to check my download limit.
Ik draw a line whith the data of my ISP and an line whith the data of
myself.

Of cource the values are diferent.

I calculate the diverence by a - b = c
But when b is greater then a the result is an negative number. I dont
like that.

So my question:

How can i calculate the line by the folowing function : abs(a - b) =
c ??

Thanks in advance.

Edwin Nadorp
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pgp public key - http://home.kabelfoon.nl/~egnadorp/EdwinNadorp.asc

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