Simple question about the use of functions "above" and "sum"

[#1]

Hi,

Assume that I've these table :

If I select the device 1 and I plot this chart :

     Dimension : time

     Expression : value-above(value)

I get what I want (even if the first value is NULL)

Now, if I select device 1 and 2 and I plot this chart :

     Dimension : time

     Expression : Sum(value-above(value))

I get : No data to display

I think it is a problem of the return value of above and the use of sum ... I am sure u have an idea

Have a nice day

Jérémy

[#2 · Accepted solution]

Hi Jeremy,

Please, take a look into attached example.

Is it what you are trying to achieve?

Kind regards,
Janusz

[#3]

Hi Janusz,

this is not exactly what i want. I've detailled there :

Dzienkuje

Jérémy