[rrd-users] rate of change

Alan Jurgensen jurgyman at yahoo.com
Wed Oct 29 19:55:01 MET 2003

I want to calculate the rate of change percentage, and add that as a
comment/gprint at bottom of graph.

assumption:  ROC = (y1 - y0) / (x1 - x0) 

my rrd is a gauge of disk space used in bytes.
i assume all I need is to keep the first byte value (y0)
and first timestamp (x0), then cdef it like this:


but howto save first values (time = x0, bytes = y0)?
this doesnt work:


Howto save first values?
any other suggestions for ROC calculation?

thx, JurgyMan

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