calculated formula problem

[atreyu]

Hi guys,

I have to calculate the difference between two values of the same item, the last value - the last value before the last, is that possible?

To be more clear;

12:33 - sensor[VBAT] = 12.1V
12:38 - sensor[VBAT] = 12.3V

I want to...

[Inc0]

Hello,

I'm trying to graph the data from a Zapcat item so I created a new item (tomcat.bw.in), type calculated, with key

last(machine-name:jmx[Catalina:type=GlobalRequestProcessor,name="ajp-apr-8009"][bytesReceived])

but it doesn't work.
The error reported...

[dvb]

First of all, I am running 1.8.4 on CentOS 5.6 x86_64 with Apache 2.2.3, Mysql 5.0.77 and PHP 5.1.6. It is mostly a "stock" config.

As others have noticed, I am seeing gaps in graphs that do not match up with any absence of data. So, I did some testing and thought I would...

[BDiE8VNy]

Hi,

graphs for all monitored systems on our site seem to have problems with "calculated Y axis MAX value" based on floating point values.
This is the case for graphs provided by item lists and custom created graphs as well.
Selecting such a graph result for instance...

[Tiflo]

Hi,

I search the "Expression" for calculated data values by hour.

I wish to subtract last item value has the value of the previous hour.


last(content_spams)-"content_spams last values of the previous hour"