Hi, ( I know the subject is pseudo-rpn... ;-) )
I expect that if I have one CDEF that essentially is COUNT and another that is a linear approximation of COUNT they should be identical (since COUNT is a line). In this reproduction recipe, I expected "count" and "trend" to have the same values, but the generated graph shows that they don't. Why is that? Is it a peculiarity of COUNT or some weirdness of LSL*? See: http://www.morch.com/download/rrd_lslquestion/rrd.png # We don't really need any data, just an rrd file. # (taken from the first example from rrdcreate) rrdtool create temperature.rrd --step 300 DS:temp:GAUGE:600:-273:5000 RRA:AVERAGE:0.5:1:1200 RRA:MIN:0.5:12:2400 RRA:MAX:0.5:12:2400 RRA:AVERAGE:0.5:12:2400 # Now we make a graph rrdtool graph rrd.png --width 500 --step 648000 --height 300 --start 1288566000 --end 1295046000 DEF:temp=temperature.rrd:temp:AVERAGE CDEF:count=temp,POP,COUNT VDEF:a=count,LSLSLOPE VDEF:b=count,LSLINT CDEF:trend=temp,POP,a,COUNT,*,b,+ LINE1:count#FF0000 LINE1:trend#0000FF PRINT:a:%6.2lf PRINT:b:%6.2lf prints out 581x349 1.00 1.00 (so "a" == 1 and "b" == 1). rrdtool xport gives similar results (but doesn't allow me to print out "a" and "b") Graph rrd.png can be seen in the link above: Peter -- Peter Valdemar Mørch http://www.morch.com _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
