value on my graph is -nan

[hardiyan46]

help me, use cacti for monitoring temperature room.
i have environmux mini LXO and my problem is value on graph is nan.
and then how to change fahrenheit to celcius on my graph.
sory in my english.

[rockygado]

use CDEF's (from Graph Management) to drive an eqn to convert from °F to °C
then
go to Graph template
click on item#2 current then add the CDEF you just made
repeat for the rest of the items

[hardiyan46]

use CDEF's (from Graph Management) to drive an eqn to convert from °F to °C
then
go to Graph template
click on item#2 current then add the CDEF you just made
repeat for the rest of the items

Thanks rocygado for reply.
where can I find the menu
I still do not understand

[rockygado]

click add

a.PNG (19.03 KiB) Viewed 1638 times

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then Create

b.PNG (7.35 KiB) Viewed 1638 times

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then add parameters

c.PNG (9.68 KiB) Viewed 1638 times