absolute value function for calculated item

[Sir_Yaro]

Hi.
Is there aby way to get a absolute value of any the item(s) ?
I performs subtraction of two values (don't know which is bigger) and as a result I need an absolute value... :/

[Yello]

Have you tried delta?


Regards,
David

[Sir_Yaro]

I'm really shocked. 5 minutes ago I was willing to bet 1000$ that I can't use delta for this. But when I checked it on a paper it turned out that I was blind...
I feel stupid.


thank you Yello

[arucard]

Hi,

i'm wondering if i can use delta also in my case.
For our business it's very critical to have all server exactly the same time, so i create an item which get ntp offset. Until offset is in <-999ms; 999ms> it's ok, but outside this i should be notified. So i created trigger:
{My_Template_Servers:ntpq.offset.last(2)}<-999|{My_Template_Servers:ntpq.offset.last(2)}>999

And of course it works, but i'm curious if i can write this trigger with delta or other way to check absolute value of this item.

Regards,
a.

[Sir_Yaro]

I don't think so. I've two independent values, you have only one. So you can compare only last and previous value (x.last(2)-x.last(1)) and such solutian has a bug:
(-800)-(-1599)=799
800-1799=-999

offset is almost 2sec but delta is still below 1sec...

ps. please someone else check that

[iprok]

I feel myself absolutely stupid, but I can't get how to use delta to resolve problem similar to the one Sir_Yaro had. Can anybody make it a little bit clear? I have two values VAL1 and VAL2 and I need a trigger or calculated value counting amount of their difference.

[iprok]

And my working solution is like:

(I - J)*(I >= J) + (J - I)*(I < J)