Wesley PA4WDH wrote: > Hi All, > > I have a question about RPN. I'm sorry if it has been > asked before. I've search my email archive but didn't > find it. > > I have a lot of rrd's with the same DS in it. What i > want to do is to calculate the sum of all the DS's and > display that in a "total" graph. > > The problem is that those DS's have a lot of unknown > values in it. What i need is a RPN that does: > > if (value_of_ds != unknown) > return new_value+total_caluclated_so_far > else return total_calculated_so_far
Yes. That is explained in the tutorial found here: http://oss.oetiker.ch/rrdtool/tut/cdeftutorial.en.html > I have tried this: > total=new_value,UN,total_calucated_so_far,total_calulated_so_far,new_value,+,IF DEF:ds_one=rrdfile.rrd:foo:AVERAGE DEF:ds_two=rrdfile.rrd:bar:AVERAGE DEF:ds_three=other_rrdfile.rrd:baz:AVERAGE CDEF:total=\ ds_one,UN,0,ds_one,IF,\ ds_two,UN,0,ds_two,IF,+,\ ds_three,UN,0,ds_three,IF,+ Something like that would do the trick. A line can be read like so: "If ds_one == UNKNOWN, then return 0; else return ds_one" > [...] S _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
