OK, perhaps I'm confused - every other example with CDEF and multiplication in the tutorial manpage has the '*' escaped or quoted:
> As most people have a better feel for numbers in this range, we'll > correct that. We could recreate our database and store the correct > data, but there is a better way: we do some calculations while creating > the png file! > > rrdtool graph speed2.png \ > --start 920804400 --end 920808000 \ > --vertical-label m/s \ > DEF:myspeed=test.rrd:speed:AVERAGE \ > CDEF:realspeed=myspeed,1000,\* \ > LINE2:realspeed#FF0000 > > Note: I need to escape the multiplication operator * with a backslash. > If I don't, the operating system may interpret it and use it for file > name expansion. You could also place the line within quotation marks > like so: > > "CDEF:realspeed=myspeed,1000,*" \ > > It boils down to: it is RRDtool which should see *, not your shell. > And it is your shell interpreting \, not RRDtool. You may need to > adjust examples accordingly if you happen to use an operating system or > shell which behaves differently. ... > Now let's create this PNG, and add some more magic ... > > rrdtool graph speed3.png \ > --start 920804400 --end 920808000 \ > --vertical-label km/h \ > DEF:myspeed=test.rrd:speed:AVERAGE \ > "CDEF:kmh=myspeed,3600,*" \ > CDEF:fast=kmh,100,GT,kmh,0,IF \ > CDEF:good=kmh,100,GT,0,kmh,IF \ > HRULE:100#0000FF:"Maximum allowed" \ > AREA:good#00FF00:"Good speed" \ > AREA:fast#FF0000:"Too fast" > > Note: here we use another means to escape the * operator by enclosing > the whole string in double quotes. But the one in "Graphics Magic" does not: > Graphics Magic > I like to believe there are virtually no limits to how RRDtool graph > can manipulate data. I will not explain how it works, but look at the > following PNG: > > rrdtool graph speed4.png \ > --start 920804400 --end 920808000 \ > --vertical-label km/h \ > DEF:myspeed=test.rrd:speed:AVERAGE \ > CDEF:nonans=myspeed,UN,0,myspeed,IF \ > CDEF:kmh=nonans,3600,* \ > CDEF:fast=kmh,100,GT,100,0,IF \ > CDEF:over=kmh,100,GT,kmh,100,-,0,IF \ > CDEF:good=kmh,100,GT,0,kmh,IF \ > HRULE:100#0000FF:"Maximum allowed" \ > AREA:good#00FF00:"Good speed" \ > AREA:fast#550000:"Too fast" \ > STACK:over#FF0000:"Over speed" rick jones _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
