CDEF "IF, then, else"

Cybernet1k · Post by **Cybernet1k** » Mon Feb 25, 2013 8:14 am

Hello! I can not make a simple function:
If CURRENT_DATA_SOURCE = 4 then 1 else 0 .
In http://oss.oetiker.ch/rrdtool/tut/rpntutorial.en.html

..."2,20,200,IF" ("if 2 then 20 else 200") evaluates to 20. And "0,1,2,IF" ("if 0 then 1 else 2) evaluates to 2...

But in debug mode "cdef=4,1,0,IF": RRDTool Says: ERROR: rpn expressions without DEF or CDEF variables are not supported.

Please help...Need cdef : if CURRENT_DATA_SOURCE = 4 then 1 else 0

victorantunes · Post by **victorantunes** » Mon Feb 25, 2013 8:47 am

you can't have a CDEF without variables

try:

CURRENT_DATA_SOURCE,POP,4,1,0,IF

Cybernet1k · Post by **Cybernet1k** » Mon Feb 25, 2013 9:32 am

victorantunes wrote:you can't have a CDEF without variables

try:

CURRENT_DATA_SOURCE,POP,4,1,0,IF

In this case, the graph value is only "1".

victorantunes · Post by **victorantunes** » Mon Feb 25, 2013 11:35 am

And thats not what you wanted?

Cybernet1k · Post by **Cybernet1k** » Tue Feb 26, 2013 2:19 am

The device gives the SNMP values from 1 to 5. I need to add cdef with a condition: If the current value is 4 then 1, else 0. For a start, used to do so: if current value used not 4 then 0. You are from Russia?

Cybernet1k · Post by **Cybernet1k** » Tue Feb 26, 2013 3:27 am

Understood ...
cdef=CURRENT_DATA_SOURCE,3,EQ,3,0,IF

Code: Select all

if (  CURRENT_DATA_SOURCE = 3 ) then
    value = 3
else
    value = 0

Cacti

CDEF "IF, then, else"

CDEF "IF, then, else"

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